msm: mhi_dev: Update data type to get mhi reset state

MHI reset state is a bit field in a register which could have
numeric value of either 0 or 1. Use an integer data type
instead of a boolean value.

Change-Id: I5e1d8c6c2c79e916a0b4757c6d4d846e683a3067
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
Signed-off-by: Siva Kumar Akkireddi <sivaa@codeaurora.org>