KVM: PPC: Add pt_regs into kvm_vcpu_arch and move vcpu->arch.gpr[] into it

Current regs are scattered at kvm_vcpu_arch structure and it will
be more neat to organize them into pt_regs structure.

Also it will enable reimplementation of MMIO emulation code with
analyse_instr() later.

Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 9703f8f..a75443a 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -486,7 +486,7 @@ struct kvm_vcpu_arch {
 	struct kvmppc_book3s_shadow_vcpu *shadow_vcpu;
 #endif
 
-	ulong gpr[32];
+	struct pt_regs regs;
 
 	struct thread_fp_state fp;