ARC: small cleanup on ML509 config

Signed-off-by: Frank Dols <frank.dols@synopsys.com>
ARC: make cache line size config configurable

Signed-off-by: Frank Dols <frank.dols@synopsys.com>
ARC: mmu v3 cache PTAG reg add to registers

Signed-off-by: Frank Dols <frank.dols@synopsys.com>
ARC: explicit disable I&D cache for us (for now !!)

Signed-off-by: Frank Dols <frank.dols@synopsys.com>
ARC: no cache handling in here

Signed-off-by: Frank Dols <frank.dols@synopsys.com>
ARC: [plat-haps51] add Ethernet support

Signed-off-by: Frank Dols <frank.dols@synopsys.com>
ARC: [plat-ml509] minor change on platform config defines

Signed-off-by: Frank Dols <frank.dols@synopsys.com>