OMAP3: PM: Enable wake-up from McBSP2, 3 and 4 modules

Wake-up from McBSP ports are needed, especially when the THRESHOLD
dma mode is in use for audio playback.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>