bpf: Add batched ops support for percpu array

Uses the already in-place infrastructure provided by the
'generic_map_*_batch' functions.

No tweak was needed as it transparently handles the percpu variant.

As arrays don't have delete operations, let it return a error to
user space (default behaviour).

Suggested-by: Jamal Hadi Salim <[email protected]>
Signed-off-by: Pedro Tammela <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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