x86: Add function comments to cb_sysinfo.h

Add a function comment for get_coreboot_info() and a declaration for
cb_get_sysinfo(), since this may be called from elsewhere.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

arch/x86/include/asm/cb_sysinfo.h

@@ -215,6 +215,22 @@ struct sysinfo_t {
 
 extern struct sysinfo_t lib_sysinfo;
 
+/**
+ * get_coreboot_info() - parse the coreboot sysinfo table
+ *
+ * Parses the coreboot table if found, setting the GD_FLG_SKIP_LL_INIT flag if
+ * so.
+ *
+ * @info: Place to put the parsed information
+ * @return 0 if OK, -ENOENT if no table found
+ */
 int get_coreboot_info(struct sysinfo_t *info);
 
+/**
+ * cb_get_sysinfo() - get a pointer to the parsed coreboot sysinfo
+ *
+ * @return pointer to sysinfo, or NULL if not available
+ */
+const struct sysinfo_t *cb_get_sysinfo(void);
+
 #endif