arm64: kvm: mte: Hide the MTE CPUID information from the guests

arm64: kvm: mte: Hide the MTE CPUID information from the guests

KVM does not support MTE in guests yet, so clear the corresponding field
in the ID_AA64PFR1_EL1 register. In addition, inject an undefined
exception in the guest if it accesses one of the GCR_EL1, RGSR_EL1,
TFSR_EL1 or TFSRE0_EL1 registers. While the emulate_sys_reg() function
already injects an undefined exception, this patch prevents the
unnecessary printk.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Steven Price <steven.price@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>