arm: dts: imx8mm-phyboard-polis-rdk: Sync dts files with kernel

Sync the devicetree files used in the kernel for the imx8mm-phyboard-polis
with the corresponding devicetree files in U-Boot.
Replaced phycore-imx8mm.dts with kernel dts imx8mm-phyboard-polis-rdk.dts

Synced with kernel 6.5.0-rc1 commit
e752a4f9589c (arm64: dts: freescale: imx8mm-phyboard: Add I2C4 pinmuxing)

Signed-off-by: Cem Tenruh <c.tenruh@phytec.de>