powerpc:t4240rdb: Disable the non-existent ethernet ports on T4240RDB

Disable the non-existent ethernet ports on T4240RDB:FM1_DTSEC5,
FM1_DTSEC6, FM2_DTSEC5 and FM2_DTSEC6.

Signed-off-by: Ying Zhang <ying.zhang22455@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <york.sun@nxp.com>
1 file changed