soc: swr-mstr: Reset swr only during init or ssr

Reset swr only during init or ssr-pdr scenarios.
Do not reset swr during clock stop, which would
result in bad state of master and cause error
interrupts.

Change-Id: I88e071921409a5b5797aeedb8e7cb57cb5d5bb9a
Signed-off-by: Ramprasad Katkam <katkam@codeaurora.org>