mpc83xx: Introduce ARCH_MPC832*

Replace CONFIG_MPC832* with proper CONFIG_ARCH_MPC832* Kconfig options.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index 20780ba..1b9402e 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -40,9 +40,11 @@
 
 config TARGET_MPC8323ERDB
 	bool "Support MPC8323ERDB"
+	select ARCH_MPC832X
 
 config TARGET_MPC832XEMDS
 	bool "Support MPC832XEMDS"
+	select ARCH_MPC832X
 	select BOARD_EARLY_INIT_F
 
 config TARGET_MPC8349EMDS
@@ -82,11 +84,13 @@
 	bool "Support suvd3"
 	select ARCH_MPC8309 if SYS_EXTRA_OPTIONS="KMTEGR1"
 	select ARCH_MPC8309 if SYS_EXTRA_OPTIONS="KMVECT1"
+	select ARCH_MPC832X if SYS_EXTRA_OPTIONS="SUVD3"
 	imply CMD_CRAMFS
 	imply FS_CRAMFS
 
 config TARGET_TUXX1
 	bool "Support tuxx1"
+	select ARCH_MPC832X
 	imply CMD_CRAMFS
 	imply FS_CRAMFS
 
@@ -128,6 +132,9 @@
 	bool
 	select ARCH_MPC831X
 
+config ARCH_MPC832X
+	bool
+
 source "board/esd/vme8349/Kconfig"
 source "board/freescale/mpc8308rdb/Kconfig"
 source "board/freescale/mpc8313erdb/Kconfig"