ARM: mach-omap2: omap3: Fix GPIO clocking in SPL

ARM: mach-omap2: omap3: Fix GPIO clocking in SPL

OMAP3_GPIO_x is needed to enable each GPIO bank on the OMAP3
boards. At one point, the #ifdef's were replaced with
if CONFIG_IS_ENABLED but this won't work for people who need
OMAP3_GPIO_x in SPL since the SPL prefix for this option isn't
used in Kconfig.  This patch moves the check to #if defined and
also makes Kconfig select the banks if CMD_GPIO is used which
makes the checks in the code less cumbersome.

Fixes: bd8a9c14c91c ("arm: mach-omap2/omap3/clock.c: Enable
all GPIO with CMD_GPIO")

Reported-by: Liam O'Shaughnessy <liam.o.shaughnessy@gumstix.com>
Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Migrate omap3_igep00x0.h]
Signed-off-by: Tom Rini <trini@konsulko.com>