ARM: OMAP: Fixes for suspend / resume GPIO wake-up handling

Use the correct wake-up enable register, and make it
work with 34xx also.

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