soc/mediatek: Add mt_pll_set_usb_clock() to enable usb clock
There are clock settings for usb in mt8195 and mt8188, so we add a new
function which is implemented in pll.c to do this.
TEST=build pass
BUG=b:
233720142
Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Change-Id: I40b358b197541bc5281645879553340059829db3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65750
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>