ASoC: msm: Add new slimbus slave driver

With the new slimbus handover feature in 8084, ADSP can go to sleep
if no audio activity other than voice call. MDM AFE port open/close
failures are observed because of slimbus master unavailability due
to APQ ADSP power collapse. Fix by create a new slimbus slave driver
which handles IOCTL vote/unvote requests from csd client to wake up
slimbus master on ADSP.

Change-Id: I0a574e6fa78d9c37de6f651c2a82c1f1cb3b3600
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>