[lkboot] add flag to disable autoboot from a project

Change-Id: Iea9c714c869543ba486f63a6604f379acd469385

app/lkboot/lkboot.c

@@ -49,6 +49,9 @@
 #ifndef LKBOOT_WITH_SERVER
 #define LKBOOT_WITH_SERVER 1
 #endif
+#ifndef LKBOOT_AUTOBOOT
+#define LKBOOT_AUTOBOOT 1
+#endif
 #ifndef LKBOOT_AUTOBOOT_TIMEOUT
 #define LKBOOT_AUTOBOOT_TIMEOUT 5000
 #endif
@@ -307,6 +310,10 @@ static void lkboot_task(const struct app_descriptor *app, void *args)
     if (platform_abort_autoboot())
         autoboot = 0;
 
+#if !LKBOOT_AUTOBOOT
+    autoboot = 0;
+#endif
+
     /* if we're going to autoobot, read the timeout value */
     lk_time_t autoboot_timeout;
     if (!autoboot) {