powerpc: P1022: Remove macro CONFIG_P1022

Replace CONFIG_P1022 with ARCH_P1022 in Kconfig and clean up existing
macros.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index 89573f8..4d9ffd3 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -108,6 +108,7 @@
 
 config TARGET_P1022DS
 	bool "Support P1022DS"
+	select ARCH_P1022
 	select SUPPORT_SPL
 	select SUPPORT_TPL
 
@@ -171,6 +172,7 @@
 
 config TARGET_CONTROLCENTERD
 	bool "Support controlcenterd"
+	select ARCH_P1022
 
 config TARGET_KMP204X
 	bool "Support kmp204x"
@@ -238,6 +240,9 @@
 config ARCH_P1010
 	bool
 
+config ARCH_P1022
+	bool
+
 source "board/freescale/b4860qds/Kconfig"
 source "board/freescale/bsc9131rdb/Kconfig"
 source "board/freescale/bsc9132qds/Kconfig"