mhi: core: send critical channels early completion events

When a client sends out channel operations, they remain blocked
until timeout is complete even if device assert takes place.
Unblock these critical clients registered with core driver by
sending them channel operation complete events with an error
code.

Change-Id: Ied812c9dffb61232fe174b4ac6e45accb3b32da9
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>