msm: pil-q6v5: Add support for 8974v2 QDSP6v5 power control

8974v2 includes an updated version of the QDSP6v5 subsystem,
which includes the following changes:
 - The MSS implementation has Block Head Switch (BHS) control,
   which was previously only present for the LPASS implementation.
 - Both subsystems now include an Low Drop-Out (LDO) regulator
   which must be configured to bypass mode when enabling the BHS.

Update the code comments to address the first point, since the
BHS was already being enabled for both LPASS and MSS anyway.

To address the second point, set the LDO_BYP bit of QDSS_PWR_CTL
at power-up. This is a reserved bit on 8974v1, so this change is
backward-compatible.

Change-Id: Ie60b7571147aaf60fc8c0e230acc42f50f8655d0
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
1 file changed