add etna_f32_to_fixp16(..) needed by etna_pipe.c

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
add basic support for emit helper functions

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
move to etna_cmd_stream

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
add etna_submit_rs_state(..)

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
fix compile

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>