fix: Fixed an issue with undeclared function calls (#73)

uboot-mtk-20230718-09eda825/common/main.c

@@ -19,6 +19,8 @@
 #include <version_string.h>
 #include <efi_loader.h>
 
+void led_control(const char *cmd, const char *name, const char *arg);
+
 static void run_preboot_environment_command(void)
 {
 	char *p;