Convert CONFIG_ARCH_CPU_INIT to Kconfig

This converts the following to Kconfig:
   CONFIG_ARCH_CPU_INIT

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/s5p4418_nanopi2_defconfig b/configs/s5p4418_nanopi2_defconfig
index 0601743..eaf319e 100644
--- a/configs/s5p4418_nanopi2_defconfig
+++ b/configs/s5p4418_nanopi2_defconfig
@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_SYS_DCACHE_OFF=y
+CONFIG_ARCH_CPU_INIT=y
 CONFIG_ARCH_NEXELL=y
 CONFIG_SYS_TEXT_BASE=0x74C00000
 CONFIG_SYS_MALLOC_LEN=0x2000000