x86: config: Enable hook for saving MRC configuration

Add a hook to ensure that this information is saved.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/coreboot/coreboot.c b/arch/x86/cpu/coreboot/coreboot.c
index 6d06d5a..4cdd0d4 100644
--- a/arch/x86/cpu/coreboot/coreboot.c
+++ b/arch/x86/cpu/coreboot/coreboot.c
@@ -99,3 +99,8 @@
 	while (*str)
 		NS16550_putc(port, *str++);
 }
+
+int misc_init_r(void)
+{
+	return 0;
+}
diff --git a/include/configs/chromebook_link.h b/include/configs/chromebook_link.h
index 7e6d239..6e8b9ef 100644
--- a/include/configs/chromebook_link.h
+++ b/include/configs/chromebook_link.h
@@ -20,6 +20,7 @@
 
 #define CONFIG_DCACHE_RAM_MRC_VAR_SIZE		0x4000
 #define CONFIG_BOARD_EARLY_INIT_F
+#define CONFIG_MISC_INIT_R
 
 #define CONFIG_NR_DRAM_BANKS			8
 #define CONFIG_X86_MRC_ADDR			0xfffa0000