platform/x86: dell-wmi: Add a keymap for KEY_MUTE in type 0x0010 table

Some platforms send the speaker-mute key from EC. dell-wmi can't
recognize it.

Add a new keymap for KEY_MUTE in type 0x0010 table.
Signed-off-by: Koba Ko <koba.ko@canonical.com>
Link: https://lore.kernel.org/r/20230117123436.200440-1-koba.ko@canonical.comReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/dell/dell-wmi-base.c

@@ -261,6 +261,9 @@ static const struct key_entry dell_wmi_keymap_type_0010[] = {
 	{ KE_KEY,    0x57, { KEY_BRIGHTNESSDOWN } },
 	{ KE_KEY,    0x58, { KEY_BRIGHTNESSUP } },
 
+	/*Speaker Mute*/
+	{ KE_KEY, 0x109, { KEY_MUTE} },
+
 	/* Mic mute */
 	{ KE_KEY, 0x150, { KEY_MICMUTE } },