x86: Move CONFIG_SYS_CAR_xxx to Kconfig

Move CONFIG_SYS_CAR_ADDR and CONFIG_SYS_CAR_SIZE to Kconfig so that
we don't need them in the board configuration file thus the same
board configuratoin file can be used to build both coreboot version
and bare version.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/chromebook_link.h b/include/configs/chromebook_link.h
index 449f0c2..318f1a8 100644
--- a/include/configs/chromebook_link.h
+++ b/include/configs/chromebook_link.h
@@ -15,9 +15,9 @@
 
 #include <configs/x86-common.h>
 
-#define CONFIG_SYS_CAR_ADDR			0xff7e0000
-#define CONFIG_SYS_CAR_SIZE			(128 * 1024)
+
 #define CONFIG_SYS_MONITOR_LEN			(1 << 20)
+
 #define CONFIG_DCACHE_RAM_MRC_VAR_SIZE		0x4000
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_DISPLAY_CPUINFO