usb: chipidea: msm: Restore wrapper settings after reset

When the RESET bit is set in the USBCMD register it resets quite
a few of the wrapper's registers to their reset state. This
includes the GENCONFIG and GENCONFIG2 registers. Currently this
is done by the usb phy and ehci-msm drivers writing into the
controller wrapper's MMIO address space. Let's consolidate the
register writes into the wrapper driver instead so that we
clearly split the wrapper from the phys.

Acked-by: Peter Chen <peter.chen@nxp.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: Peter Chen <peter.chen@nxp.com>