ps3fb: use FB_SYS_* instead of FB_CFB_*

ps3fb: Use the FB_SYS_* operations instead of the FB_CFB_* operations as the
actual frame buffer memory is part of system RAM

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>