ARC: Add perf support for ARC700 cores

This adds basic perf support for ARC700 cores. Most PERF_COUNT_HW* events
are supported now.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --cc arch/arc/boot/dts/angel4.dts
Simple merge

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

diff --cc arch/arc/kernel/Makefile
Simple merge

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