[MIPS] ARC: Get rid of mips_machgroup

This has not been any serious user of this ill conceived thing since the
original invention in like '95.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/vr41xx/nec-cmbvr4133/setup.c

@@ -64,7 +64,6 @@ static void __init nec_cmbvr4133_setup(void)
 #endif
 	set_io_port_base(KSEG1ADDR(0x16000000));
 
-	mips_machgroup = MACH_GROUP_NEC_VR41XX;
 	mips_machtype = MACH_NEC_CMBVR4133;
 
 #ifdef CONFIG_PCI