arm64: dts: ti: k3-am65: disable "mcu_cpsw" in SoC file and enable in board file

arm64: dts: ti: k3-am65: disable "mcu_cpsw" in SoC file and enable in board file

Following the existing convention of disabling nodes in the SoC file and
enabling only the required ones in the board file, disable "mcu_cpsw" node
in the SoC file "k3-am65-mcu.dtsi" and enable it in the board file
"k3-am654-base-board.dts". Also, now that "mcu_cpsw" is disabled in the
SoC file, disabling it in "k3-am65-iot2050-common.dtsi" is no longer
required. Hence, remove the section corresponding to this change.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Link: https://patch.msgid.link/20251015111344.3639415-3-s-vadapalli@ti.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>