usb: musb: tusb6010: fix a possible missing data type replacement

Replace "unsigned" to "u32" for checkpatch fix to tusb_writeb().

Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200316211136.2274-9-b-liu@ti.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>