Fix DYNAMIC_ARCH build for POWER9

Setting DYNAMIC_ARCH=1 on POWER9 does not build POWER9 files due to some
compiler version checks.  This patch fixes some of the macros that are used
to check compiler version.  On fixing those checks, there are some new make
failures related to icamin, icamax, isamin, isamax and caxpy files on POWER9.
This patch fixes those failures as well.

kernel/power/caxpy_power9.S

@@ -13,7 +13,11 @@
 
 	PROLOGUE
 
+#ifdef CONJ
+caxpyc_k:
+#else
 caxpy_k:
+#endif
 .LCF0:
 0:	addis 2,12,.TOC.-.LCF0@ha
 	addi 2,2,.TOC.-.LCF0@l

kernel/power/icamax_power9.S

@@ -1,3 +1,4 @@
+/*
 	.file	"icamax.c"
 	.abiversion 2
 	.section	".text"
@@ -5,6 +6,12 @@
 	.p2align 4,,15
 	.globl icamax_k
 	.type	icamax_k, @function
+*/
+#define ASSEMBLER
+#include "common.h"
+
+        PROLOGUE
+
 icamax_k:
 .LCF0:
 0:	addis 2,12,.TOC.-.LCF0@ha

kernel/power/icamin_power9.S

@@ -1,3 +1,4 @@
+/*
 	.file	"icamin.c"
 	.abiversion 2
 	.section	".text"
@@ -5,6 +6,12 @@
 	.p2align 4,,15
 	.globl icamin_k
 	.type	icamin_k, @function
+*/
+#define ASSEMBLER
+#include "common.h"
+
+        PROLOGUE
+
 icamin_k:
 .LCF0:
 0:	addis 2,12,.TOC.-.LCF0@ha

kernel/power/isamax_power9.S

@@ -1,3 +1,4 @@
+/*
 	.file	"isamax.c"
 	.abiversion 2
 	.section	".text"
@@ -5,6 +6,12 @@
 	.p2align 4,,15
 	.globl isamax_k
 	.type	isamax_k, @function
+*/
+#define ASSEMBLER
+#include "common.h"
+
+        PROLOGUE
+
 isamax_k:
 .LCF0:
 0:	addis 2,12,.TOC.-.LCF0@ha

kernel/power/isamin_power9.S

@@ -1,3 +1,4 @@
+/*
 	.file	"isamin.c"
 	.abiversion 2
 	.section	".text"
@@ -5,6 +6,12 @@
 	.p2align 4,,15
 	.globl isamin_k
 	.type	isamin_k, @function
+*/
+#define ASSEMBLER
+#include "common.h"
+
+        PROLOGUE
+
 isamin_k:
 .LCF0:
 0:	addis 2,12,.TOC.-.LCF0@ha