Tuna: add option to reclaim ~73 MB of reserved RAM (HUGEMEM)

Reclaim 69M of RAM from HEAP_TILER and 4M from the OMAP
framebuffer. This will break 1080p video recording and
some camera functionalities, unless 1080p modes are
disabled from within /system/etc/media_profiles.xml.

Credits go to mpokwsths.

Conflicts:
	arch/arm/mach-omap2/Kconfig
HUGEMEM: rename to BIGMEM and add 8 MB to HEAP_TILER again

Some apps were crashing because the available
memory for video capturing was too low.

Conflicts:
	arch/arm/mach-omap2/Kconfig
Update config.