rmnet_shs: power save indication and ssr fix

Get notified of rmnet driver status in order to cleanup
when rmnet goes into idle mode.
SSR fix to reinit module after SSR.
Perf burst selection fix. Fix perf cpu selection during
a rx burst always returning 0.

CRs-Fixed: 2316002
Change-Id: I199c49a36a328da7457fdb24c0302815e1a2edf9
Acked-by: Raul Martinez <mraul@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>