[media] lgdt3306a: fix spelling mistake "supportted" -> "supported"

Trivial fix to spelling mistake in pr_warn message.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>