arm: perf: kill off unused pm callbacks

Currently the arm perf code has platdata callbacks for runtime PM and
irq handling, but no platform implements the hooks for the former. Kill
these off.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --cc arch/arm/include/asm/pmu.h
Simple merge

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

diff --cc arch/arm/kernel/perf_event_cpu.c
Simple merge