powerpc/64s: Remove unnecessary relocation branch from idle handler

The system reset idle handler system_reset_idle_common is relocated, so
relocation is not required to branch to kvm_start_guest. The superfluous
relocation does not result in incorrect code, but it does not compile
outside of exception-64s.S (with fixed section definitions).
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/exception-64s.h

@@ -256,11 +256,6 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 	ld	r9,area+EX_R9(r13);					\
 	bctr
 
-#define BRANCH_TO_KVM(reg, label)					\
-	__LOAD_FAR_HANDLER(reg, label);					\
-	mtctr	reg;							\
-	bctr
-
 #else
 #define BRANCH_TO_COMMON(reg, label)					\
 	b	label
@@ -268,9 +263,6 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 #define BRANCH_LINK_TO_FAR(reg, label)					\
 	bl	label
 
-#define BRANCH_TO_KVM(reg, label)					\
-	b	label
-
 #define __BRANCH_TO_KVM_EXIT(area, label)				\
 	ld	r9,area+EX_R9(r13);					\
 	b	label

arch/powerpc/kernel/exceptions-64s.S

@@ -142,7 +142,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
 	lbz	r0,HSTATE_HWTHREAD_REQ(r13)
 	cmpwi	r0,0
 	beq	1f
-	BRANCH_TO_KVM(r10, kvm_start_guest)
+	b	kvm_start_guest
 1:
 #endif