msm: dsps: Revise handling of PPSS_PAUSE register.

Only modify the PPSS_PAUSE register if the apps processor controls
the DSPS power state. The Linux kernel shouldn't modify the register
if the DSPS is in control of its own power state.

Also move the definition of the PPSS_PAUSE_REG address to the devices
file, since it may be different on different platforms.

Change-Id: I58d108515806085357c66a5165ba71bb930302fa
CRs-Fixed: 370236
Acked-by: John Larkin <jlarkin@qualcomm.com>
Signed-off-by: Karthik Karuppasamy <kkaruppa@codeaurora.org>