msm: adsprpc: Open APPS SMD channel forever

SMD channel is opened always on DSP side and the same on
APPS side closed and re-opened during an SSR.
This change lets the SMD channel on the APPS side to be
open forever.

Change-Id: Ie6159a5af503bc582c0db0434392b6f15b0dc443
Acked-by: Chenna Kesava Raju <chennak@qti.qualcomm.com>
Signed-off-by: Mohammed Nayeem Ur Rahman <mohara@codeaurora.org>