Revert "HACK: arm64: dts: ti: k3-j7200-common-proc-board: Disable PCIe and SERDES"

Enable PCIe and SERDES, since multi-link support is added in u-boot and
the changes adapted in both kernel and ethernet firmware.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>