imx8: cpu: add function for reading FEC MAC from fuse

FEC driver requires imx_get_mac_from_fuse(). Add it in preparation
for ENETx support.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
1 file changed