arm64/sysreg: Expose MTE_frac so that it is visible to KVM

arm64/sysreg: Expose MTE_frac so that it is visible to KVM

KVM exposes the sanitised ID registers to guests. Currently these ignore
the ID_AA64PFR1_EL1.MTE_frac field, meaning guests always see a value of
zero.

This is a problem for platforms without the MTE_ASYNC feature where
ID_AA64PFR1_EL1.MTE==0x2 and ID_AA64PFR1_EL1.MTE_frac==0xf. KVM forces
MTE_frac to zero, meaning the guest believes MTE_ASYNC is supported, when
no async fault will ever occur.

Before KVM can fix this, the architecture needs to sanitise the ID
register field for MTE_frac.

Linux itself does not use MTE_frac field and just assumes MTE async faults
can be generated if MTE is supported.

Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Link: https://lore.kernel.org/r/20250512114112.359087-2-ben.horgan@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>