[ALPS08675531] xhci: wait irq to prevent from devapc violation

add synchronize_irq() function to wait xhci irq done.
0x11200024 is xhci->op_regs->status.

log:
bus_id:0x401, vio_addr:0x11200024, slave_type:0x2, shift_sta_bit:1
Violation Type: "Power/clock might not enabled"

MTK-Commit-Id: 42b4d25dec8bde90868963d1baf6919163fc0616

CR-Id: ALPS08675531
Feature: usb_ssusb
Change-Id: If8692991b2a3ac4f999166a2313f224ece26664c
Signed-off-by: Denis Hsu <denis.hsu@mediatek.com>