H2: Don't try to use phy_bbpll_en_usb

[bjoernQ]

The feature phy-enable-usb tries to use that function which is not present for H2.

In esp-idf they use a replacement for phy_init.c ( phy_init_esp32hxx.c ) which doesn't use it.

But how to get jtag-serial output to work then?

[bjoernQ]

Removed the usage of phy_bbpll_en_usb in esp-rs/esp-wifi-sys#456 - at least prevents linker errors and is the right thing to do