binderfs: Fix binderfs.c selftest compilation warning

binderfs: Fix binderfs.c selftest compilation warning

Fix missing braces compilation warning in the ARM
compiler environment:
    drivers/android/binderfs.c: In function 'binderfs_fill_super':
    drivers/android/binderfs.c:650:9: warning: missing braces around initializer [-Wmissing-braces]
      struct binderfs_device device_info = { 0 };
    drivers/android/binderfs.c:650:9: warning: (near initialization for ‘device_info.name’) [-Wmissing-braces]

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20200411145151.5576-1-tangbin@cmss.chinamobile.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>