powerpc/64s: Move branch cache flushing bcctr variant to ppc-ops.h

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200609070610.846703-6-npiggin@gmail.com

arch/powerpc/kernel/entry_64.S

@@ -261,8 +261,6 @@ _ASM_NOKPROBE_SYMBOL(save_nvgprs);
 1:	nop;			\
 	patch_site 1b, patch__call_flush_branch_caches
 
-#define BCCTR_FLUSH	.long 0x4c400420
-
 .macro nops number
 	.rept \number
 	nop
@@ -293,7 +291,7 @@ flush_branch_caches:
 	li	r9,0x7fff
 	mtctr	r9
 
-	BCCTR_FLUSH
+	PPC_BCCTR_FLUSH
 
 2:	nop
 	patch_site 2b patch__flush_count_cache_return
@@ -302,7 +300,7 @@ flush_branch_caches:
 
 	.rept 278
 	.balign 32
-	BCCTR_FLUSH
+	PPC_BCCTR_FLUSH
 	nops	7
 	.endr