V4L/DVB: cx18: rename cx18-alsa.c

Rename cx18-alsa.c to cx18-alsa-main.c so that we can call the final .ko file
cx18-alsa.ko

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/cx18/cx18-alsa.c b/drivers/media/video/cx18/cx18-alsa-main.c
similarity index 100%
rename from drivers/media/video/cx18/cx18-alsa.c
rename to drivers/media/video/cx18/cx18-alsa-main.c