UPSTREAM: usb: musb: Add musb_clearb/w() interface

Delete the const attribute of addr parameter in readb/w/l hooks, these
changes are for implementing clearing W1C registers.
Replace musb_readb/w with musb_clearb/w to clear the interrupt status.

While at here, change some unsigned type to u32 to fix checkpatch.pl
warnings.

Bug: 158724613
Signed-off-by: Min Guo <min.guo@mediatek.com>
[b-liu@ti.com: fix checkpatch.pl warnings.]
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200115132547.364-23-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 9c93d7fd464e7aad59c2afc261f80e6e0fbe2ca9)
Change-Id: I7c9045ddf9f0958ebb7e6e34b9bf20b622b9210a