follow up the following change:
commit 4262b09cbf08a6721515531263f28fbd21e547d5
Author: Xiang Xiao <xiaoxiang@xiaomi.com>
Date: Fri Dec 17 02:58:49 2021 +0800
libc: Implement terminal api regardless of CONFIG_SERIAL_TERMIOS setting
since many functions aren't related to termios directly
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>