ALSA: compress: add support for gapless playback

this add new API for sound compress to support gapless playback.
As noted in Documentation change, we add API to send metadata of encoder and
padding delay to DSP. Also add API for indicating EOF and switching to
subsequent track

Also bump the compress API version

Conflicts:
	include/uapi/sound/compress_offload.h

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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.

CRs-Fixed: 458904
Change-Id: I8111e8652bbfb6dd93bdbda69bd16f53b45cb756
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>