sun8i_mixer.h include is misplaced. Move it.
Acked-by: NMaxime Ripard <mripard@kernel.org>
Signed-off-by: NJernej Skrabec <jernej.skrabec@siol.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200224173901.174016-8-jernej.skrabec@siol.net