msm: mhi_dev: Update release function in MHI

After MHI device receives a reset command the internal
state machine suspends all activity on the channel and
processes the device reset. Clients are notified on
the channel close. Existing close function checks if
there are pending data to be read but since the device
is in the process of cleaning the transfer buffers
and the channels are suspended this check is not required.

commit msm: mhi_dev: Update release function in MHI
(6772e50d7b8fc).

Change-Id: Iafc5249762b1468ee2cca4ac141522ce0356d403
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
Signed-off-by: Manoharan Vijaya Raghavan <mraghava@codeaurora.org>