msm: mhi: Stop sending event completion, during channel reset

The change is to prevent sending channel completion events,
post a channel stop or reset command.

Sending a channel completion post reset can cause the RP
to in reset value and hence the completion will be treated
as an out of order event.

Change-Id: I2cdd7a705a001689609ff8fa1f31fe11d61e5ea8
Signed-off-by: Subramanian Ananthanarayanan <skananth@codeaurora.org>
Signed-off-by: Gauri Joshi <gaurjosh@codeaurora.org>