net: fsl_enetc: Introduce enetc_is_ls1028a()

Introduce accurate test for LS1028A compatibility based both on
IS_ENABLED(CONFIG_ARCH_LS1028A) and PCI vendor ID. This is done
in preparation for adding ENETCv4 support, which has a different
PCI vendor ID.

Signed-off-by: Marek Vasut <marex@denx.de>
1 file changed