msm: mhi_dev: Use disable_irq_nosync to disable MHI A7 irq

Use disable_irq_nosync API to disable the MHI_A7 interrupt
since disable_irq should not be called from interrupt context.

Change-Id: I9d543cb5bed116c6a7fa8481cb710be97195c4c0
Signed-off-by: Siva Kumar Akkireddi <sivaa@codeaurora.org>