usb: musb: Perform only write access on MUSB_INTRRXE

This is part of the workaround for AM35x advisory Advisory 1.1.20.
The advisory says that the IPSS bridge can't handle 8 & 16 bit read
access. An 16bit read access to MUSB_INTRRXE results in an 32bit read
access which also reads INTRUSB and therefore may lose interrupts.
This patch uses a shadow register of MUSB_INTRRXE so we only perform
write access to it.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --cc drivers/usb/musb/musb_core.c
Simple merge

diff --cc drivers/usb/musb/musb_core.h
Simple merge

diff --cc drivers/usb/musb/musb_gadget.c
Simple merge