UPSTREAM: dt-bindings: usb: musb: Add support for MediaTek musb controller

This adds support for MediaTek musb controller in
host, peripheral and otg mode.

Bug: 158724613
Signed-off-by: Min Guo <min.guo@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200115132547.364-20-b-liu@ti.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
(cherry picked from commit 8d817d79349d953c8b05559e4cfd448785550e78)
Change-Id: Ia87cc819fd084fd15a166ace3ec55bbd1349db2e