video: tegra: backport Tegra SD Gen2 support from Tegra 4

Conflicts:
	drivers/video/tegra/Kconfig
mach-tegra: board-grouper-panel.c: updated for updated smartdimmer
defconfig: a63
Merge branch 'a1-mr2' of https://github.com/Metallice/android_kernel_grouper into a1-mr2