MAINTAINERS: Add perf list for drivers/perf/

drivers/perf/ contains drivers for the perf subsystem, so it makes sense
that the perf list, linux-perf-users@vger.kernel.org, should be
included for perf drivers.

Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: James Clark <james.clark@linaro.org>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250109152811.3402943-1-robh@kernel.org


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