phy: msm: usb: Remove MPM related code

MPM wakeup pins for both DP and DM interrupts are mapped to the
same interrupt usb1_hs_async_wakeup_irq. And since async_irq is
enabled on msm_otg_suspend, so the wakeup interrupts from MPM
shall work fine. Hence remove MPM related support.

Change-Id: I9a384fec1f0e9cd71cbe0ce63d8bbdee61ab35c4
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>