ARM: perf: add PMUv2 common event definitions

The PMUv2 specification reserves a number of event encodings
for common events.

This patch adds these events to the common event enumeration
in preparation for PMUv2 cores, such as Cortex-A15.

Change-Id: Iea424bb8cb7c6ec59a565c75bd899de5b36e1f90
Acked-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
[tdas@codeaurora.org: fixup msm ARMV7_PERFCTR_PC_BRANCH_MIS_USED
is now replaced with ARMV7_PERFCTR_PC_BRANCH_PRED]
Signed-off-by: Taniya Das <tdas@codeaurora.org>