msm: bam_dmux: reduce kernel log chatter

Every time a uplink wakeup sequence occurs, the underlying SPS driver
logs some BAM information to the kernel log.  The message is identical
for each occurence, and the information is only relevant at system boot.
To reduce the log chatter after system boot, make use of the constrained
logging SPS feature.

CRs-Fixed: 473102
Change-Id: I1454722d387317ad1b74f5ae09bb55f6a9a9d941
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>