OMAP3: GPIO fixes for off-mode

Off mode is now using the omap2 retention fix code for scanning GPIOs
during off-mode transitions. All the *non_wakeup_gpios variables
are now used for off-mode transition tracking on OMAP3. This patch fixes
cases where GPIO state changes are missed during off-mode.

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>