drivers/perf: hisi: Remove unnecessary check of counter index

The sanity check for counter index has been done in the function
hisi_uncore_pmu_get_event_idx, so remove the redundant interface
hisi_uncore_pmu_counter_valid() and sanity check.

Cc: Mark Rutland <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: John Garry <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Co-developed-by: Qi Liu <[email protected]>
Signed-off-by: Qi Liu <[email protected]>
Signed-off-by: Shaokun Zhang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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