USB: msm72k_otg: Handle clearing all otg interrupt status bits

Hardware is generating a 1MSIS interrupt during PHY reset while doing a
USB disconnect and is not being cleared. Handle such corner cases and
clear all otg interrupts.

CRs-Fixed: 384247
Change-Id: I0b220fa05a3446471f2c5adac197339fac1ed9d7
Signed-off-by: Rajkumar Raghupathy <raghup@codeaurora.org>