ALSA: include: Add new ioctl for metadata mode
Add a new ioctl to support metadata mode in lpa driver. This ioctl
allows lpa driver to work in default alsa compliant mode and also
metadata mode.

Change-Id: I3242f39a8bb807a068d209c8e232ce232426a86a

Conflicts:
	include/sound/compress_offload.h
	sound/core/pcm_native.c