linux: dcw_otg: more robust interrupt handling
See: https://github.com/raspberrypi/linux/pull/330

kernel: fix for Oops in dwc_otg_dump_spram.
See https://github.com/raspberrypi/firmware/issues/21

firmware: fix, part 2, for audo sync when pcm decoder combines multiple packets.
See http://forum.xbmc.org/showthread.php?tid=140518&pid=1463506#pid1463506