msm: sps: Support low memory condition in SPS driver

In low memory conditions BAM DMUX is getting time out while allocating
memory through kzalloc.

Add Flag support in kzalloc while allocating memory and avoid delay
during memory allocation

CRs-Fixed: 790361
Change-Id: I01bad1642ea9f38ffd723b51ccb8addcd3efbbcf
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>