powerpc: P1021: Remove macro CONFIG_P1021

Replace CONFIG_P1021 with ARCH_P1021 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 9142b33..5550687 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -144,6 +144,7 @@
 	bool "Support P1021RDB"
 	select SUPPORT_SPL
 	select SUPPORT_TPL
+	select ARCH_P1021
 
 config TARGET_P1024RDB
 	bool "Support P1024RDB"
@@ -287,6 +288,9 @@
 config ARCH_P1020
 	bool
 
+config ARCH_P1021
+	bool
+
 config ARCH_P1022
 	bool
 
diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index 26a6786..515647d 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -75,7 +75,7 @@
 obj-$(CONFIG_ARCH_P1010)	+= p1010_serdes.o
 obj-$(CONFIG_ARCH_P1011)	+= p1021_serdes.o
 obj-$(CONFIG_ARCH_P1020)	+= p1021_serdes.o
-obj-$(CONFIG_P1021)	+= p1021_serdes.o
+obj-$(CONFIG_ARCH_P1021)	+= p1021_serdes.o
 obj-$(CONFIG_ARCH_P1022)	+= p1022_serdes.o
 obj-$(CONFIG_ARCH_P1023)	+= p1023_serdes.o
 obj-$(CONFIG_P1024)	+= p1021_serdes.o
diff --git a/arch/powerpc/cpu/mpc85xx/speed.c b/arch/powerpc/cpu/mpc85xx/speed.c
index 4e63859..8155620 100644
--- a/arch/powerpc/cpu/mpc85xx/speed.c
+++ b/arch/powerpc/cpu/mpc85xx/speed.c
@@ -596,7 +596,7 @@
 #endif
 
 #ifdef CONFIG_QE
-#if defined(CONFIG_P1021) || defined(CONFIG_P1025)
+#if defined(CONFIG_ARCH_P1021) || defined(CONFIG_P1025)
 	sys_info->freq_qe =  sys_info->freq_systembus;
 #else
 	qe_ratio = ((gur->porpllsr) & MPC85xx_PORPLLSR_QE_RATIO)
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 4947e18..bcd7550 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -199,7 +199,7 @@
 #define CONFIG_USB_MAX_CONTROLLER_COUNT	2
 #endif
 
-#elif defined(CONFIG_P1021)
+#elif defined(CONFIG_ARCH_P1021)
 #define CONFIG_MAX_CPUS			2
 #define CONFIG_SYS_FSL_NUM_LAWS		12
 #define CONFIG_SYS_PPC_E500_DEBUG_TLB	2
diff --git a/arch/powerpc/include/asm/immap_85xx.h b/arch/powerpc/include/asm/immap_85xx.h
index c82c709..b0f81ec 100644
--- a/arch/powerpc/include/asm/immap_85xx.h
+++ b/arch/powerpc/include/asm/immap_85xx.h
@@ -2488,7 +2488,7 @@
 	u8	res11a[76];
 	par_io_t qe_par_io[7];
 	u8	res11b[1600];
-#elif defined(CONFIG_P1021) || defined(CONFIG_P1025)
+#elif defined(CONFIG_ARCH_P1021) || defined(CONFIG_P1025)
 	u8      res11a[12];
 	u32     iovselsr;
 	u8      res11b[60];