ARM: 7335/1: mach-u300: do away with MMC config files

All the special stuff (like registering input device and so on)
for the U300 MMC is now done away with. We don't need these
special MMC setup kludges, merge this into core.c and be done
with it.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>