KVM: arm64: Add PMSIDR_EL1 to the SPE register context

PMSIDR_EL1 is not part of the VCPU register context because the profiling
control registers were not trapped and the register is read-only. With the
introduction of the KVM_ARM_VCPU_SPE_STOP API, KVM will start trapping
accesses to the profiling control registers, add PMSIDR_EL1 to the VCPU
register context to prevent KVM injecting undefined exceptions.