Fix fastpath issues

Since mmci_request() can be called from a non-interrupt
context, and does, during kernel init, causing a host
of debug messages during boot if you enable spinlock debugging,
we need to use the spinlock calls that save IRQ flags and
restore them.
Signed-off-by: NLinus Walleij <triad@df.lth.se>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>