731/2: Fix U300 generic GPIO, remove ifdefs from MMCI v3

The #ifdefs in the MMCI driver were erroneous and just masking
a bug in the U300 generic GPIO implementation. This removes the
ifdefs and fixes the U300 generic GPIO instead.

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