Changes in compilers / warnings/errors caused this to stop compiling.
Delete the write-only code.
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D36532
This adds the USB 2.0 and 3.0 PHY support for the IPQ4018/IPQ4019.
All it really needs to do is gate the relevant clocks on/off in the
right order with the right delays.