usb: msm_otg: workaround for D+ D- HV interrupts in PHY retention

This commit clears HW chicken bit in the D+ D- HV interrupts mechanism.
When this chicken bit is set (by default) then when USB PHY in retention
mode and these interrupts are active, an extra interrupt is fired, causing
for immediate wake up from bus suspend.

Change-Id: I69b281403023bcd15032a181eed43ddb6abcd919
Signed-off-by: Ido Shayevitz <idos@codeaurora.org>