A133+Android10 关闭串口打印

修改longan/device/config/chips/a133/configs/default/env.cfg：

diff --git a/configs/default/env.cfg b/configs/default/env.cfg
index 2b5cac4..0e1f265 100644
--- a/configs/default/env.cfg
+++ b/configs/default/env.cfg
@@ -6,7 +6,8 @@ console=ttyS0,115200
nand_root=/dev/nand0p4
mmc_root=/dev/mmcblk0p4
init=/init
-loglevel=4
+loglevel=0