CXO_CLK is running as 19.2 MHz whereas USB PHYs are directly feed ref clock
from XO which is running at 38.4MHz. Hence replace RPMH_CXO_CLK with
RPMH_CXO_PAD_CLK for voting/devoting from USB PHYs driver.
Change-Id: I7c6fe3aac46ec1615323ce6b6886df40dc7425ea