powerpc: MPC8555: Remove macro CONFIG_MPC8555

Replace CONFIG_MPC8555 with ARCH_MPC8555 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 8b08ee2..c58f76f 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -76,6 +76,7 @@
 
 config TARGET_MPC8555CDS
 	bool "Support MPC8555CDS"
+	select ARCH_MPC8555
 
 config TARGET_MPC8560ADS
 	bool "Support MPC8560ADS"
@@ -207,6 +208,9 @@
 config ARCH_MPC8548
 	bool
 
+config ARCH_MPC8555
+	bool
+
 source "board/freescale/b4860qds/Kconfig"
 source "board/freescale/bsc9131rdb/Kconfig"
 source "board/freescale/bsc9132qds/Kconfig"
diff --git a/arch/powerpc/cpu/mpc85xx/cpu.c b/arch/powerpc/cpu/mpc85xx/cpu.c
index c563744..3e6f8f3 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu.c
@@ -294,7 +294,7 @@
 {
 /* Everything after the first generation of PQ3 parts has RSTCR */
 #if defined(CONFIG_ARCH_MPC8540) || defined(CONFIG_ARCH_MPC8541) || \
-    defined(CONFIG_MPC8555) || defined(CONFIG_MPC8560)
+	defined(CONFIG_ARCH_MPC8555) || defined(CONFIG_MPC8560)
 	unsigned long val, msr;
 
 	/*
diff --git a/arch/powerpc/cpu/mpc85xx/speed.c b/arch/powerpc/cpu/mpc85xx/speed.c
index bd810d7..93c7193 100644
--- a/arch/powerpc/cpu/mpc85xx/speed.c
+++ b/arch/powerpc/cpu/mpc85xx/speed.c
@@ -626,7 +626,7 @@
 		 */
 		lcrr_div *= 4;
 #elif !defined(CONFIG_ARCH_MPC8540) && !defined(CONFIG_ARCH_MPC8541) && \
-    !defined(CONFIG_MPC8555) && !defined(CONFIG_MPC8560)
+	!defined(CONFIG_ARCH_MPC8555) && !defined(CONFIG_MPC8560)
 		/*
 		 * Yes, the entire PQ38 family use the same
 		 * bit-representation for twice the clock divider values.
@@ -682,7 +682,7 @@
 	 * AN2919.
 	 */
 #if defined(CONFIG_ARCH_MPC8540) || defined(CONFIG_ARCH_MPC8541) || \
-	defined(CONFIG_MPC8560) || defined(CONFIG_MPC8555) || \
+	defined(CONFIG_MPC8560) || defined(CONFIG_ARCH_MPC8555) || \
 	defined(CONFIG_P1022)
 	gd->arch.i2c1_clk = sys_info.freq_systembus;
 #elif defined(CONFIG_ARCH_MPC8544)