raw/gdtc: support dequeue operation

Add rawdev dequeue operation for gdtc devices.

Signed-off-by: Yong Zhang <zhang.yong25@zte.com.cn>

raw/gdtc: support enqueue operation

Add rawdev enqueue operation for gdtc devices.

Signed-off-by: Yong Zhang <zhang.yong25@zte.com.cn>

raw/gdtc: support basic operations

Add support for rawdev operations such as dev_start and dev_stop.

Signed-off-by: Yong Zhang <zhang.yong25@zte.com.cn>

raw/gdtc: support queue setup operation

Add queue initialization and release interface.

Signed-off-by: Yong Zhang <zhang.yong25@zte.com.cn>

raw/gdtc: introduce driver skeleton

Introduce rawdev driver support for GDTC which
can help to connect two separate hosts with each other.

Signed-off-by: Yong Zhang <zhang.yong25@zte.com.cn>