Hi,

This patch adds the permission model enhancement and memory
attribute index enhancement features and their corresponding
system registers in AArch64 assembler.
Permission Indirection Extension (FEAT_S1PIE, FEAT_S2PIE)
Permission Overlay Extension (FEAT_S1POE, FEAT_S2POE)
Memory Attribute Index Enhancement (FEAT_AIE)
Extension to Translation Control Registers (FEAT_TCR2)

These features are available by default from Armv9.4-A architecture.

Regression tested for aarch64-none-elf target and found
no regressions.

Ok for binutils-master?

Regards,
Srinath.