FB: sa1100: use inf members directly

Now that the LCD information is available while the driver is loaded,
we don't need to cache that information into our driver private data
structure.  Get rid of it.

Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>