x86: apl: Add LPC driver

This driver the LPC and provides a few functions to set up LPC features.
These should probably use ioctls() or perhaps, better, have specific
uclass methods.

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 2d78368..31045a0 100644
--- a/arch/x86/cpu/apollolake/Makefile
+++ b/arch/x86/cpu/apollolake/Makefile
@@ -6,5 +6,6 @@
 
 obj-y += hostbridge.o
 obj-y += itss.o
+obj-y += lpc.o
 obj-y += pmc.o
 obj-y += uart.o