Perf: Compile L2 code depending on chip

To avoid including the l2-accessors API needlessly for all L2 PMU's,
compile-in L2 perf code depending on the ARM implementation.

Change-Id: Ib26d58fecb5b440f95415c1b47d55f919fea523f
Signed-off-by: Ashwin Chaugule <ashwinc@codeaurora.org>
3 files changed