perf/arm: Move 32-bit PMU drivers to drivers/perf/

It is preferred to put drivers under drivers/ rather than under arch/.
The PMU drivers also depend on arm_pmu.c, so it's better to place them
all together.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240626-arm-pmu-3-9-icntr-v2-3-c9784b4f4065@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>