[media] snd_tea575x: Add support for tuning AM

Add support for tuning AM (on devices with the necessary additional
hardware components), and advertise the available bands using the new
VIDIOC_ENUM_FREQ_BANDS ioctl.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
CC: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/radio/radio-shark.c b/drivers/media/radio/radio-shark.c
index 72ded29..e1970bf 100644
--- a/drivers/media/radio/radio-shark.c
+++ b/drivers/media/radio/radio-shark.c
@@ -333,6 +333,7 @@
 	shark->tea.radio_nr = -1;
 	shark->tea.ops = &shark_tea_ops;
 	shark->tea.cannot_mute = true;
+	shark->tea.has_am = true;
 	strlcpy(shark->tea.card, "Griffin radioSHARK",
 		sizeof(shark->tea.card));
 	usb_make_path(shark->usbdev, shark->tea.bus_info,