x86: apl: Add SPL/TPL init

Add code to init the system both in TPL and SPL. Each phase has its own
procedure.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/apollolake/Makefile b/arch/x86/cpu/apollolake/Makefile
index 37e4209..edde122 100644
--- a/arch/x86/cpu/apollolake/Makefile
+++ b/arch/x86/cpu/apollolake/Makefile
@@ -2,6 +2,7 @@
 #
 # Copyright 2019 Google LLC
 
+obj-$(CONFIG_SPL_BUILD) += cpu_spl.o
 obj-$(CONFIG_SPL_BUILD) += spl.o
 obj-$(CONFIG_SPL_BUILD) += systemagent.o
 obj-y += cpu_common.o