get rid of fixed addresses in struct rs_state

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

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

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
etna_submit_rs_state(..) makes use of etna_cmd_stream_reloc(..)

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