mhi: cntrl: qcom: add support to retrieve device failure reason

Allow the core driver to send the buffer to device which can be
used to populate the subsytem failure reason upon assert.

Change-Id: Ia93b3a19560c4929bfe9b059f2ba2d821c7bf4f6
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>