soc: qcom: bam_dmux: Use bam_ops function pointers for sps resets

All SPS reset calls should use the function pointer found in the bam_ops
structure so that the calls can be intercepted by a dynamically loadable
loopback test module.

Change-Id: I1643f93587a5128625908dd2f4561216e5630085
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>