ARM: dts: r9a06g032: Add USB PHY DT support

Define the r9a06g032 generic part of the USB PHY device node.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Link: https://lore.kernel.org/r/20220429134143.628428-7-herve.codina@bootlin.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>