Description: ipv6: use prandom_u32() for ID generation
References:
 https://arxiv.org/pdf/2112.09604.pdf
Notes:
Bugs:
upstream: released (5.14-rc1) [62f20e068ccc50d6ab66fdb72ba90da2b9418c99]
5.10-upstream-stable: released (5.10.51) [8f939b79579715b195dc3ad36669707fce6853ee]
4.19-upstream-stable: released (4.19.198) [f0be58ec9931907e980cf21737e51d369808eb95]
4.9-upstream-stable: released (4.9.276) [3fc852e59c0a48094cc0f1b2e866604986bbcd31]
sid: released (5.14.6-1)
5.10-bullseye-security: released (5.10.70-1)
4.19-buster-security: released (4.19.208-1)
4.9-stretch-security: released (4.9.290-1)