soc: qcom: bam_dmux: Use SPS atomic allocation flag

Bam_dmux sometimes calls sps_connect() during time sensitive operations.
Sps_connect() internally has some memory allocations which may stall during
low memory conditions and can cause a timeout in bam_dmux.

SPS supports a configuration flag which changes these memory allocations
to atomic.  Use this flag to prevent allocations from stalling and leading
to timeouts.

CRs-Fixed: 790361
Change-Id: Icde45f7b08a4b4a2b664c40d088fd338b48ac8fa
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>