msm: sps: Add loglevel property in IPC logging for SPS driver

IPC logging for SPS driver, helps monitoring the interactions
between BAM clients and SPS driver and helps tracking the BAM
status. Add a loglevel field such that clients can specify the
loglevel to be captured in IPC logging.

Change-Id: Ib3af72485caa48940efca74b2cec2464a09ffed8
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>