bpf: Introduce bpf_mem_cache_free_rcu(). #22486

Job	Run time
set-matrix	1s
build for x86_64 with gcc	4m 16s
build for x86_64 with llvm-16	4m 25s
build for aarch64 with gcc	5m 0s
build for s390x with gcc	11m 1s
veristat	1m 40s
test_progs on x86_64 with gcc	4m 36s
test_progs_parallel on x86_64 with gcc	2m 51s
test_progs_no_alu32 on x86_64 with gcc	3m 36s
test_progs_no_alu32_parallel on x86_64 with gcc	2m 19s
test_maps on x86_64 with gcc	2m 50s
test_verifier on x86_64 with gcc	1m 43s
test_progs on x86_64 with llvm-16	4m 31s
test_progs_parallel on x86_64 with llvm-16	2m 47s
test_progs_no_alu32 on x86_64 with llvm-16	3m 38s
test_progs_no_alu32_parallel on x86_64 with llvm-16	2m 36s
test_maps on x86_64 with llvm-16	2m 47s
test_verifier on x86_64 with llvm-16	1m 28s
test_progs on aarch64 with gcc	4m 56s
test_progs_parallel on aarch64 with gcc	2m 55s
test_progs_no_alu32 on aarch64 with gcc	4m 15s
test_progs_no_alu32_parallel on aarch64 with gcc	2m 37s
test_maps on aarch64 with gcc	3m 3s
test_verifier on aarch64 with gcc	1m 25s
test_progs on s390x with gcc	16m 55s
test_progs_no_alu32 on s390x with gcc	11m 45s
test_maps on s390x with gcc	42m 46s
test_verifier on s390x with gcc	2m 44s
	2h 35m 26s

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