SUSE: 2022:0764-1 Important: Branch Target Injection Fixes

The SUSE Linux Enterprise 15 SP2 RT kernel was updated to receive various security and bugfixes. Transient execution side-channel attacks attacking the Branch History Buffer (BHB), named "Branch Target Injection" and "Intra-Mode Branch History Injection" are now mitigated. The following security bugs were fixed: - CVE-2022-0001: Fixed Branch History Injection vulnerability (bsc#1191580). - CVE-2022-0002: Fixed Intra-Mode Branch Target Injection vulnerability (bsc#1191580). The following non-security bugs were fixed: - btrfs: check for missing device in btrfs_trim_fs (bsc#1195701). - lib/iov_iter: initialize "flags" in new pipe_buffer (bsc#1196584). - nfsd: allow delegation state ids to be revoked and then freed (bsc#1192483). - nfsd: allow open state ids to be revoked and then freed (bsc#1192483).