powerpc: P2020: Remove macro CONFIG_P2020

Replace CONFIG_P2020 with ARCH_P2020 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 90777db..51192fe 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -162,6 +162,7 @@
 	bool "Support P2020RDB-PC"
 	select SUPPORT_SPL
 	select SUPPORT_TPL
+	select ARCH_P2020
 
 config TARGET_P1_TWR
 	bool "Support p1_twr"
@@ -232,6 +233,7 @@
 
 config TARGET_XPEDITE550X
 	bool "Support xpedite550x"
+	select ARCH_P2020
 
 config TARGET_UCP1020
 	bool "Support uCP1020"
@@ -306,6 +308,9 @@
 config ARCH_P1025
 	bool
 
+config ARCH_P2020
+	bool
+
 source "board/freescale/b4860qds/Kconfig"
 source "board/freescale/bsc9131rdb/Kconfig"
 source "board/freescale/bsc9132qds/Kconfig"
diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index a3fba03..acf57b7 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -81,7 +81,7 @@
 obj-$(CONFIG_ARCH_P1024)	+= p1021_serdes.o
 obj-$(CONFIG_ARCH_P1025)	+= p1021_serdes.o
 obj-$(CONFIG_P2010)	+= p2020_serdes.o
-obj-$(CONFIG_P2020)	+= p2020_serdes.o
+obj-$(CONFIG_ARCH_P2020)	+= p2020_serdes.o
 obj-$(CONFIG_PPC_P2041) += p2041_serdes.o
 obj-$(CONFIG_PPC_P3041) += p3041_serdes.o
 obj-$(CONFIG_PPC_P4080) += p4080_serdes.o
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 6874b54..814a9fb 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -295,7 +295,7 @@
 #define CONFIG_SYS_FSL_ERRATUM_A004508
 #define CONFIG_SYS_FSL_ERRATUM_A005125
 
-#elif defined(CONFIG_P2020)
+#elif defined(CONFIG_ARCH_P2020)
 #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/fsl_law.h b/arch/powerpc/include/asm/fsl_law.h
index 4e5ea5f..eee78c8 100644
--- a/arch/powerpc/include/asm/fsl_law.h
+++ b/arch/powerpc/include/asm/fsl_law.h
@@ -85,7 +85,7 @@
 #if defined(CONFIG_ARCH_BSC9131) || defined(CONFIG_ARCH_BSC9132)
 	LAW_TRGT_IF_OCN_DSP = 0x03,
 #else
-#if !defined(CONFIG_ARCH_MPC8572) && !defined(CONFIG_P2020)
+#if !defined(CONFIG_ARCH_MPC8572) && !defined(CONFIG_ARCH_P2020)
 	LAW_TRGT_IF_PCIE_3 = 0x03,
 #endif
 #endif
@@ -121,7 +121,7 @@
 #define LAW_TRGT_IF_PCIE_1	LAW_TRGT_IF_PCI
 #endif
 
-#if defined(CONFIG_ARCH_MPC8572) || defined(CONFIG_P2020)
+#if defined(CONFIG_ARCH_MPC8572) || defined(CONFIG_ARCH_P2020)
 #define LAW_TRGT_IF_PCIE_3	LAW_TRGT_IF_PCI
 #endif
 #endif /* CONFIG_FSL_CORENET */
diff --git a/arch/powerpc/include/asm/immap_85xx.h b/arch/powerpc/include/asm/immap_85xx.h
index f8a6a78..ba0faa8 100644
--- a/arch/powerpc/include/asm/immap_85xx.h
+++ b/arch/powerpc/include/asm/immap_85xx.h
@@ -2940,7 +2940,7 @@
 #define CONFIG_SYS_MPC85xx_PCIX2_OFFSET		0x9000
 #define CONFIG_SYS_MPC85xx_PCIE1_OFFSET         0xa000
 #define CONFIG_SYS_MPC85xx_PCIE2_OFFSET         0x9000
-#if defined(CONFIG_ARCH_MPC8572) || defined(CONFIG_P2020)
+#if defined(CONFIG_ARCH_MPC8572) || defined(CONFIG_ARCH_P2020)
 #define CONFIG_SYS_MPC85xx_PCIE3_OFFSET         0x8000
 #else
 #define CONFIG_SYS_MPC85xx_PCIE3_OFFSET         0xb000