sched/spawn: Support task_spawnattr_[set|get]stackaddr

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

binfmt/binfmt_exec.c

@@ -110,6 +110,13 @@ int exec_spawn(FAR const char *filename, FAR char * const *argv,
         {
           bin->stacksize = attr->stacksize;
         }
+
+#ifndef CONFIG_BUILD_KERNEL
+      if (attr->stackaddr != NULL)
+        {
+          bin->stackaddr = attr->stackaddr;
+        }
+#endif
     }
 
   /* Disable pre-emption so that the executed module does