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/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index adad3d3..471d27a 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -283,7 +283,7 @@
 #define CONFIG_SYS_FSL_ERRATUM_A005125
 #define CONFIG_USB_MAX_CONTROLLER_COUNT	1
 
-#elif defined(CONFIG_P1022)
+#elif defined(CONFIG_ARCH_P1022)
 #define CONFIG_MAX_CPUS			2
 #define CONFIG_SYS_FSL_NUM_LAWS		12
 #define CONFIG_SYS_PPC_E500_DEBUG_TLB	2