soc: swr-mstr: Ignore redundant slave path control command

Slave could trigger multiple path control api multiple times
after connect/disconnect port. Avoid handling the api without
new connect/disconnect requests to reduce latency.

Change-Id: I4db52fdebfd6b7c0fe3f388f25dfaa4981d5f61c
Signed-off-by: Ramprasad Katkam <katkam@codeaurora.org>