arm/qemu: Add mounting of tmpfs

Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>

boards/arm/qemu/qemu-armv7a/src/qemu_bringup.c

@@ -117,6 +117,17 @@ int qemu_bringup(void)
 {
   int ret;
 
+#ifdef CONFIG_FS_TMPFS
+  /* Mount the tmpfs file system */
+
+  ret = nx_mount(NULL, CONFIG_LIBC_TMPDIR, "tmpfs", 0, NULL);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: Failed to mount tmpfs at %s: %d\n",
+             CONFIG_LIBC_TMPDIR, ret);
+    }
+#endif
+
 #ifdef CONFIG_FS_PROCFS
   /* Mount the procfs file system */