Board-pyramid: revise memory map

*Increased framebuffer size (there's a good chance that Android 4.2+ requires more framebuffer memory)
*Increased surfaceflinger size
*Renamed the higher memory ifdef to CONFIG_PYRAMID_MORE_RAM
*The higher memory option gives userspace 614MB of RAM while the normal option is 593MB of RAM
*Added back math equations

Signed-off-by: Sultanxda <sultanxda@gmail.com>