rename symbol: CONFIG_KIRKWOOD -> CONFIG_ARCH_KIRKWOOD

Have this symbol follow the pattern of all other such symbols.
This patch also removes a TODO from the code.

Reviewed-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
diff --git a/arch/arm/mach-mvebu/Makefile b/arch/arm/mach-mvebu/Makefile
index b739520..7e9c206 100644
--- a/arch/arm/mach-mvebu/Makefile
+++ b/arch/arm/mach-mvebu/Makefile
@@ -10,14 +10,14 @@
 
 else # CONFIG_ARM64
 
-ifdef CONFIG_KIRKWOOD
+ifdef CONFIG_ARCH_KIRKWOOD
 
 obj-y	= dram.o
 obj-y	+= gpio.o
 obj-y	+= mbus.o
 obj-y	+= timer.o
 
-else # CONFIG_KIRKWOOD
+else # CONFIG_ARCH_KIRKWOOD
 
 obj-y	= cpu.o
 obj-y	+= dram.o
@@ -73,5 +73,5 @@
 obj-$(CONFIG_ARMADA_38X) += serdes/a38x/
 obj-$(CONFIG_ARMADA_XP) += serdes/axp/
 
-endif # CONFIG_KIRKWOOD
+endif # CONFIG_ARCH_KIRKWOOD
 endif # CONFIG_ARM64
diff --git a/arch/arm/mach-mvebu/mbus.c b/arch/arm/mach-mvebu/mbus.c
index a95db5e..39bd200 100644
--- a/arch/arm/mach-mvebu/mbus.c
+++ b/arch/arm/mach-mvebu/mbus.c
@@ -411,7 +411,7 @@
 	return 0;
 }
 
-#ifndef CONFIG_KIRKWOOD
+#ifndef CONFIG_ARCH_KIRKWOOD
 static void mvebu_mbus_get_lowest_base(struct mvebu_mbus_state *mbus,
 				       phys_addr_t *base)
 {
@@ -479,7 +479,7 @@
 			return -ENOMEM;
 	}
 
-#ifndef CONFIG_KIRKWOOD
+#ifndef CONFIG_ARCH_KIRKWOOD
 	/*
 	 * Re-configure the mbus bridge registers each time this function
 	 * is called. Since it may get called from the board code in
@@ -497,7 +497,7 @@
 	int ret;
 	int i;
 
-#if defined(CONFIG_KIRKWOOD)
+#if defined(CONFIG_ARCH_KIRKWOOD)
 	mbus_state.soc = &kirkwood_mbus_data;
 #endif
 #if defined(CONFIG_ARCH_MVEBU)