arm64: dts: imx943-evk: add ENETC, EMDIO and PTP Timer support

arm64: dts: imx943-evk: add ENETC, EMDIO and PTP Timer support

Add ENETC instance 1~3, EMDIO and PTP Timer 0~1 support.
The EMDIO provides MDIO bus for ENETCs to access their external PHYs.
The PTP Timer provides current time with nanosecond resolution, precise
periodic pulse, pulse on timeout, and time capture on external pulse
support. It also provides PTP clock for ENETCs to implement time
synchronization as required for IEEE 1588 and  IEEE 802.1AS-2020.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>