This deprecates old set/reset_scoop_gpio interfacein favour of
support for generic gpio interface.

It requires gpiolib, so it depends on the previous patch
(gpiolib for SA-1100).
Signed-off-by: NDmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>