MAINTAINERS: Include drivers subdirs for ARM PMU PROFILING AND DEBUGGING entry

Ensure that the ARM PMU PROFILING AND DEBUGGING maintainers are included
for the HiSilicon PMU driver.

Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1592392648-128331-1-git-send-email-john.garry@huawei.com


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