amd/renoir/acp: use the machine driver's name for top-level's conf

On the machines with amd renoir audio, the /sys/class/sound/card2/
device/driver links to /sys/bus/platform/drivers/acp_pdm_mach.

Signed-off-by: Hui Wang <hui.wang@canonical.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/ucm2/module/snd_acp3x_rn.conf b/ucm2/module/acp_pdm_mach.conf
similarity index 100%
rename from ucm2/module/snd_acp3x_rn.conf
rename to ucm2/module/acp_pdm_mach.conf