SRAM Partition

Partitioned 512 KB SRAM memory into Frame Buffer (300KB) and GPU_FF
(212KB).
GPU Design Freeze

All GPU features implemented & tested:
- Picasso (Scoreboard has issues, but small fill images look fine)
- Host Access to Mulberry Bus
- Host Access to SRAM Frame Buffer

In general, the frame buffer scoreboard works only for line drawing
checks. Rest features will have errors.