config: Reduce 'defconfig' size using 'savedefconfig' target

Series-to: wandboard
Cover-letter:
Pending patches to make Wandboard kernel aligned with Yocto one

These patches were cook when updating Freescale BSP to 3.0.35-4.0.0 in
meta-fsl-arm. There are two groups of patches:

Config changes: add / remove settings as per use in Yocto. I think all
them are safe to enable. It also use 'savedefconfig' to generate the
final 'defconfig' file so it is easier to compare in future changes.

GPU code changes: patches cherry-pick from FSL 3.0.35-4.0.0 which were
missing during update of the kernel version. These were quite time
consuming to figure as in the end the lack of those ended producing a
'segfault' in Xorg initialization which took me 5 days to find. :-(

So, here goes these patches...
END

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
gpu-viv: Avoid possible use of uninitialized memory

This ensure the kernel does not try to access an uninitialized memory
which cause a Xorg segfault.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>