bpf: change int cmd argument in __sys_bpf into typed enum bpf_cmd

This improves BTF data recorded about this function and makes
debugging/tracing better, because now command can be displayed as
symbolic name, instead of obscure number.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240905210520.2252984-1-andrii@kernel.orgSigned-off-by: Alexei Starovoitov <ast@kernel.org>

kernel/bpf/syscall.c

@@ -5670,7 +5670,7 @@ static int token_create(union bpf_attr *attr)
 	return bpf_token_create(attr);
 }
 
-static int __sys_bpf(int cmd, bpfptr_t uattr, unsigned int size)
+static int __sys_bpf(enum bpf_cmd cmd, bpfptr_t uattr, unsigned int size)
 {
 	union bpf_attr attr;
 	int err;