mpc83xx: Introduce ARCH_MPC834*

Replace CONFIG_MPC834* with proper CONFIG_ARCH_MPC834* Kconfig options.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/arch/powerpc/include/asm/immap_83xx.h b/arch/powerpc/include/asm/immap_83xx.h
index 318b79d..bf7a4b9 100644
--- a/arch/powerpc/include/asm/immap_83xx.h
+++ b/arch/powerpc/include/asm/immap_83xx.h
@@ -625,7 +625,7 @@
 	u8 fixme[0x2000];
 } tdmdmac83xx_t;
 
-#if defined(CONFIG_MPC834x)
+#if defined(CONFIG_ARCH_MPC834X)
 typedef struct immap {
 	sysconf83xx_t		sysconf;	/* System configuration */
 	wdt83xx_t		wdt;		/* Watch Dog Timer (WDT) Registers */
@@ -666,7 +666,7 @@
 	u8			res7[0xC0000];
 } immap_t;
 
-#ifndef	CONFIG_MPC834x
+#ifndef	CONFIG_ARCH_MPC834X
 #ifdef CONFIG_HAS_FSL_MPH_USB
 #define CONFIG_SYS_MPC83xx_USB1_OFFSET  0x22000	/* use the MPH controller */
 #define CONFIG_SYS_MPC83xx_USB2_OFFSET	0
@@ -946,7 +946,7 @@
 #endif
 #define CONFIG_SYS_MPC83xx_USB1_ADDR \
 			(CONFIG_SYS_IMMR + CONFIG_SYS_MPC83xx_USB1_OFFSET)
-#if defined(CONFIG_MPC834x)
+#if defined(CONFIG_ARCH_MPC834X)
 #define CONFIG_SYS_MPC83xx_USB2_ADDR \
 			(CONFIG_SYS_IMMR + CONFIG_SYS_MPC83xx_USB2_OFFSET)
 #endif