GSD-2022-1000261 powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06

powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06 This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.19 by commit...