soc: swr-mstr: switch to bank 0 before ssr/pdr

Do bank switch to default bank during ssr/pdr as master
is reset to default state. This avoids wrong state of
swr master during pdr.

Change-Id: I86a7bd53d471e9d864d25dcb84ad8fe12151cc0d
Signed-off-by: Ramprasad Katkam <katkam@codeaurora.org>