mhi: cntrl: qcom: bring MHI out of suspend prior to MHI shutdown

During MHI shutdown, MHI host would issue an MHI reset to
controller. Therefore, if power-off occurs while MHI is in a
suspended state, MHI resume needs to occur first.

CRs-Fixed: 2446191
Change-Id: Iadd354cf51daabffad35555c43297e6ced4b177a
Acked-by: Bhaumik Vasav Bhatt <bbhatt@qti.qualcomm.com>
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>