arm64: dts: imx8mn-var-som-symphony: update USB OTG for new board versions

USB OTG is currently not working for new versions of the Variscite
Symphony EVK and imx8mn nano SOM (versions >= 1.4a).

The PTN5150 circuitry on newer versions of the Symphony EVK board has
a non-standard configuration in which the PTN5150 IRQ pin is left
unconnected, and the PTN5150 ID pin is connected to GPIO1_IO11. This
requires changes to the ptn5150 driver to support this new mode.
Variscite have indicated their intention to submit those changes
upstream.

In the meantime, import device tree changes from linux-5.15 branch of
varigit repos to at least make the USB OTG port operate correctly in
host mode.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>