H300, X5: Optimised lcd_yuv_blit(), using line-pair zig-zag writing to the LCD controller. ~7% speedup on H300, ~5% speedup on X5.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15111 a1c6a512-1295-4272-9138-f99709370657
4 files changed