dt-bindings: usb: rockchip,dwc3: update inno usb2 phy binding name

The binding for the inno usb2 phy was given a name in more a common format,
so update the reference in rockchip,dwc3.yaml as well.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/f8747552-d23b-c4cd-cb17-5033fb7f8eb6@gmail.com
Signed-off-by: Rob Herring <robh@kernel.org>