soc: qcom: spcom: allow commands for not connected channel

Test channel connection state only for commands that need to communicate
to SPU. All other commands do not need channel to be connected.

Change-Id: I372ab6cb6d9f897143c3591c93c4e3821d657da3
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>