nuttx/driver/rpmsg: new folder, extract common rpmsg api in rptun.c to rpmsg.c. rpmsg provide rpmsg_ops to each backend for specific implementation. Signed-off-by: wangyongrong <wangyongrong@xiaomi.com>
ping is not only rptun support, so move it to public part. Signed-off-by: wangyongrong <wangyongrong@xiaomi.com>
Signed-off-by: wangyongrong <wangyongrong@xiaomi.com>
Signed-off-by: ligd <liguiding1@xiaomi.com>
