soc: swr-mstr: Ignore device up during SSR

New audio session may be opened just before SSR
has occured. Ignore device up notification due to
new session during SSR as soundwire hardware is
not ready.

Change-Id: I06a558d0fa9e31ed6bbdfab80402ba7b337e7ad8
signed-off-by: Ramprasad Katkam <katkam@codeaurora.org>