Set color depth to 8 if in pseudocolor in vesafb.  The CLUT size,
previously saved as {red|green|blue}.length, is now private to vesafb.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>