backports: remove DRM driver

Maintaining the DRM driver takes a lot of recourses as there they are
depending on many API changes done to the core kernel code and
currently we do not have that many recourses to follow them. On the
other side one needs also new userspace drivers to make use of the new
features added to the DRM kernel drivers and it is not easy to update
the X drivers. Therefore we came to the conclusion to remove the drm
drivers for now.

There were also some problems with some DRM drivers, like the Intel
i915 driver caused kernel panic on some systems and was probably only
usable on some very recent kernel versions.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove platform drivers

The platform drivers were only needed by some DRM drivers and are not
needed any more with the DRM driver being removed.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove BACKPORT_BUILD_CROSS_RESERVATION

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove CPTCFG_BACKPORT_BUILD_WW_MUTEX

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove BACKPORT_BUILD_RADIX_HELPERS

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove BACKPORT_BUILD_HDMI

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove more hdmi stuff

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove some stuff related to MTRR

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove scatterlist

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove ktime_get_monotonic_offset()

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove devm_regmap_init_spi()

This is not used by any code in backports, not even a DRM driver.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove compat_wake_up_locked()

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove i2c_bit_algo()

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove cpufreq_quick_get_max()

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove shmem_read_mapping_page_gfp()

This was only needed for some of the DRM drivers, remove it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove pci_platform_rom()

This was only used by the DRM drivers

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove linux/pagemap.h

This was just used by some GPU drivers

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: remove vga_switcheroo.h

This only used by the DRM drivers

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: fix kernel dependencies for regulator drivers

These drivers are depending on changes of the regulator core driver
which are not in the specific kernel versions.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: VIDEO_RENESAS_VSP1 depends on kernel >= 3.6

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>