omap3: gpio pin config bugfixes

Bugfix several GPIO mux configurations which didn't enable the
input drivers, but weren't named as e.g. ..._GPIO141_OUT.
These bugs were added quite recently, for OMAP3 EVM support.

To help avoid such bugs in the future, update the comment to
clarify the rule:  always use PIN_INPUT, unless the name uses
that name suffix, to be crystal-clear on the signal's use as
output-only.

(Also adds GPIO-63, for the EVM's MMC-1 writeprotect switch.
Presumably that works right...)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>