KVM: PPC: Book3S HV: Fix host radix SLB optimisation with hash guests

Commit 68ad28a4 ("KVM: PPC: Book3S HV: Fix radix guest SLB side
channel") incorrectly removed the radix host instruction patch to skip
re-loading the host SLB entries when exiting from a hash
guest. Restore it.

Fixes: 68ad28a4 ("KVM: PPC: Book3S HV: Fix radix guest SLB side channel")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

arch/powerpc/kvm/book3s_hv_rmhandlers.S

@@ -1525,6 +1525,9 @@ guest_exit_cont:		/* r9 = vcpu, r12 = trap, r13 = paca */
 	stw	r5,VCPU_SLB_MAX(r9)
 
 	/* load host SLB entries */
+BEGIN_MMU_FTR_SECTION
+	b	guest_bypass
+END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX)
 	ld	r8,PACA_SLBSHADOWPTR(r13)
 
 	.rept	SLB_NUM_BOLTED