ASoC: msm: add Slimbus7 loopback volume mixer control

Add mixer control for Slimbus7 Loopback Volume and missing
links in routing driver for SLIMBUS_7_RX.

CRs-Fixed: 1117314
Change-Id: I519e0a03386d1ce4e4a32243e4f8cfe20d5041aa
Signed-off-by: Satya Krishna Pindiproli <satyak@codeaurora.org>
2 files changed