drm/i2c: nxp-tda998x (v2)

Driver for the NXP TDA998X i2c hdmi encoder slave.

v1: original
v2: fix npix/nline programming

Signed-off-by: Rob Clark <robdclark@gmail.com>
drm/tilcdc: add encoder slave

Add output panel driver for i2c encoder slaves.

Signed-off-by: Rob Clark <robdclark@gmail.com>
drm/tilcdc: add support for LCD panels (v4)

Add an output panel driver for LCD panels.  Tested with LCD3 cape on
beaglebone.

v1: original
v2: s/of_find_node_by_name()/of_get_child_by_name()/ from Pantelis
    Antoniou
v3: add backlight support
v4: rebase to latest of video timing helpers

Signed-off-by: Rob Clark <robdclark@gmail.com>