Documentation: hisi-pmu: Drop reference to /sys/devices path

Having assigned a parent to the device, the suggested path is
no longer valid. As /sys/bus/event_sources based path is also
provided, simply drop mention of alternative.

Reviewed-by: Yicong Yang <[e-mail]>
Reviewed-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Will Deacon <[e-mail]>

Documentation/admin-guide/perf/hisi-pmu.rst

···
 HHA and DDRC etc. The available events and configuration options shall
 be described in the sysfs, see:
 
-/sys/devices/hisi_sccl{X}_<l3c{Y}/hha{Y}/ddrc{Y}>/, or
 /sys/bus/event_source/devices/hisi_sccl{X}_<l3c{Y}/hha{Y}/ddrc{Y}>.
 The "perf list" command shall list the available events from sysfs.