perf/arm: Drop unused functions

For ARM's implementation, perf_instruction_pointer() and
perf_misc_flags() are equivalent to the generic versions in
include/linux/perf_event.h so arch/arm doesn't need to provide its
own versions. Drop them here.

Signed-off-by: Colton Lewis <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Oliver Upton <[email protected]>
Acked-by: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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