Merge branch 'bpf-add-percpu-map-value-size-check'

Tao Chen says:

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bpf: Add percpu map value size check

Check percpu map value size first and add the test case in selftest.

Change list:
- v2 -> v3:
    - use bpf_map_create API and mv test case in map_percpu_stats.c
- v1 -> v2:
    - round up map value size with 8 bytes in patch 1
    - add selftest case in patch 2
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Link: https://lore.kernel.org/r/20240910144111.1464912-1-chen.dylane@gmail.com
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>