paca

Enable v8.3-A Pointer Authentication extension.

CPUs:

• ampere1
• apple-a12
• apple-a13
• apple-a14
• apple-latest
• apple-m1
• apple-s4
• apple-s5
• cortex-a510
• cortex-a710
• cortex-a78c
• cortex-r82
• cortex-x1c
• cortex-x2
• neoverse-512tvb
• neoverse-n2
• neoverse-v1
• saphira
• thunderx3t110