kernel: armsr: kmod-fsl-enetc-net: use common library

kernel: armsr: kmod-fsl-enetc-net: use common library

NXP has introduced an evolved version of the LS1028A ENETC
IP in their new i.MX94/5 family. While the two devices
share a common lineage, they are different enough that
they cannot be implemented in the same driver.

Hence some functions from the LS1028A ENETC driver have been
split into a 'library'.

When a kmod package for the new ENETC (nxp-enetc4) is introduced then
the packaging for the common library will need to be reworked.

Signed-off-by: Mathew McBride <matt@traverse.com.au>
Link: https://github.com/openwrt/openwrt/pull/21433
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>