msm: restart_7k: Disable local IRQ interrupt

While doing the power on/off test, there is a chance
where APPS proc can receive the proc comm interrupt from
the modem. But at this stage proc comm channels are
already disabled and can't handle any new proc comm
requests that are coming in. Hence disable the local
interrupts.

Change-Id: If80928e69ae0d1522b0da186e075142122d9558d
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>