mpc83xx: Introduce ARCH_MPC831*

Replace CONFIG_MPC833* with proper CONFIG_ARCH_MPC833* 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 142b924..20780ba 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -17,6 +17,7 @@
 
 config TARGET_VE8313
 	bool "Support ve8313"
+	select ARCH_MPC8313
 
 config TARGET_VME8349
 	bool "Support vme8349"
@@ -28,11 +29,13 @@
 
 config TARGET_MPC8313ERDB
 	bool "Support MPC8313ERDB"
+	select ARCH_MPC8313
 	select BOARD_EARLY_INIT_F
 	select SUPPORT_SPL
 
 config TARGET_MPC8315ERDB
 	bool "Support MPC8315ERDB"
+	select ARCH_MPC8315
 	select BOARD_EARLY_INIT_F
 
 config TARGET_MPC8323ERDB
@@ -65,6 +68,7 @@
 
 config TARGET_IDS8313
 	bool "Support ids8313"
+	select ARCH_MPC8313
 	select DM
 	imply CMD_DM
 
@@ -113,6 +117,17 @@
 	bool
 	select ARCH_MPC830X
 
+config ARCH_MPC831X
+	bool
+
+config ARCH_MPC8313
+	bool
+	select ARCH_MPC831X
+
+config ARCH_MPC8315
+	bool
+	select ARCH_MPC831X
+
 source "board/esd/vme8349/Kconfig"
 source "board/freescale/mpc8308rdb/Kconfig"
 source "board/freescale/mpc8313erdb/Kconfig"