Description: bpf: Add missing map_get_next_key method to bloom filter map.
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2048259
 https://lore.kernel.org/bpf/20210921210225.4095056-2-joannekoong@fb.com/
 https://lore.kernel.org/bpf/d5776f5d-3416-4e3b-8751-8a5a9e6a0d4d@iogearbox.net/T/
Notes:
 carnil> Introduced with 9330986c0300 ("bpf: Add bloom filter map
 carnil> implementation") in 5.16-rc1.
Bugs:
upstream: released (5.17-rc1) [3ccdcee28415c4226de05438b4d89eb5514edf73]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
4.9-upstream-stable: N/A "Vulnerable code not present"
sid: N/A "Vulnerable code not present"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"
4.9-stretch-security: N/A "Vulnerable code not present"