ASoC: rsnd: don't use normal *mod in adg.c

adg.c is used from ssi/src/cmd. Thus don't use confusable *mod here.
This patch rename it to ssi_mod/src_mod/cmd_mod

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>