arm64: dts: renesas: r8a77990: Add USB 3.0 PHY and USB3S0 clock nodes

arm64: dts: renesas: r8a77990: Add USB 3.0 PHY and USB3S0 clock nodes

Add USB 3.0 PHY and PHY clock node for R-Car E3.  The PHY node is
different in that it does not have control registers and extal clock,
which are not routed to the SoC pads on R-Car E3, therefore describe the
PHY as usb-nop-xceiv simple PHY.  Add USB3S0 clock pad fixed-clock node,
the frequency has to be overridden at board level.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260118135038.8033-7-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>