USB: msm_otg: Don't set IDHVINT bit in peripheral only mode

Currently ID is not routed to PHY due to which spurious async
interrupt is getting triggered after putting PHY into retention
if IDHVINT bit is set. Fix this by not setting IDHVINT bit and
configuring the async IRQ for EDGE triggered.

CRs-Fixed: 406840
Change-Id: I6b5aae10eed68601f96a3d6fe16aa56912d4b23d
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>