powerpc: C29X: Move CONFIG_PPC_C29X to Kconfig option

Replace CONFIG_PPC_C29X with ARCH_C29X 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 4fd2ea6..640c846 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -33,6 +33,7 @@
 
 config TARGET_C29XPCIE
 	bool "Support C29XPCIE"
+	select ARCH_C29X
 	select SUPPORT_SPL
 	select SUPPORT_TPL
 	select PHYS_64BIT
@@ -185,6 +186,9 @@
 config ARCH_BSC9132
 	bool
 
+config ARCH_C29X
+	bool
+
 config ARCH_MPC8544
 	bool
 
diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index e545112..bfff58e 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -65,7 +65,7 @@
 obj-$(CONFIG_SYS_FSL_QORIQ_CHASSIS2) += fsl_corenet2_serdes.o
 
 # SoC specific SERDES support
-obj-$(CONFIG_PPC_C29X)	+= c29x_serdes.o
+obj-$(CONFIG_ARCH_C29X)	+= c29x_serdes.o
 obj-$(CONFIG_MPC8536) += mpc8536_serdes.o
 obj-$(CONFIG_ARCH_MPC8544) += mpc8544_serdes.o
 obj-$(CONFIG_ARCH_MPC8548) += mpc8548_serdes.o
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index dfea750..c2402a8 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -959,7 +959,7 @@
 #ifdef CONFIG_FSL_CAAM
 	sec_init();
 
-#if defined(CONFIG_PPC_C29X)
+#if defined(CONFIG_ARCH_C29X)
 	if ((SVR_SOC_VER(svr) == SVR_C292) ||
 	    (SVR_SOC_VER(svr) == SVR_C293))
 		sec_init_idx(1);