arc: use common of_flat_dt_match_machine

Convert arc to use the common of_flat_dt_match_machine function.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>

diff --cc arch/arc/include/asm/mach_desc.h
Simple merge

diff --cc arch/arc/kernel/devtree.c
Simple merge

diff --cc arch/arc/kernel/setup.c
Simple merge