arm/debug: consolidate addruart macros for CONFIG_DEBUG_ICEDCC

We have the same (empty) macro for all IDEDCC flavours, so consolidate
it to one.
Signed-off-by: NJeremy Kerr <jeremy.kerr@canonical.com>

arch/arm/kernel/debug.S

@@ -22,11 +22,11 @@
 #if defined(CONFIG_DEBUG_ICEDCC)
 		@@ debug using ARM EmbeddedICE DCC channel
 
-#if defined(CONFIG_CPU_V6)
-
 		.macro	addruart, rx, tmp
 		.endm
 
+#if defined(CONFIG_CPU_V6)
+
 		.macro	senduart, rd, rx
 		mcr	p14, 0, \rd, c0, c5, 0
 		.endm
@@ -51,9 +51,6 @@
 
 #elif defined(CONFIG_CPU_V7)
 
-		.macro	addruart, rx, tmp
-		.endm
-
 		.macro	senduart, rd, rx
 		mcr	p14, 0, \rd, c0, c5, 0
 		.endm
@@ -71,9 +68,6 @@ wait:		mrc	p14, 0, pc, c0, c1, 0
 
 #elif defined(CONFIG_CPU_XSCALE)
 
-		.macro	addruart, rx, tmp
-		.endm
-
 		.macro	senduart, rd, rx
 		mcr	p14, 0, \rd, c8, c0, 0
 		.endm
@@ -98,9 +92,6 @@ wait:		mrc	p14, 0, pc, c0, c1, 0
 
 #else
 
-		.macro	addruart, rx, tmp
-		.endm
-
 		.macro	senduart, rd, rx
 		mcr	p14, 0, \rd, c1, c0, 0
 		.endm