mhi: core: Move to error state as soon as RDDM is detected

To reduce the chances of a race where error conditions may end
up being missed, move MHI to an error detected state before
issuing the RDDM entry callback to the controller.

Change-Id: I1f52a87eb35ba944406ec226be6712f0d186ca11
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>