ASoC: msm: qdsp6v2: Add controls using snd_soc_add_platform_controls

The elements ".control" and ".num_controls" have been
removed from snd_soc_platform_drivers. Hence add the
gapless control using snd_soc_add_platform_controls.

Change-Id: I4c7c7d4c8255018a1d60493cc0db5b9cd746bb06
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>