[media] tda18271: add missing entries for qam_7 to tda18271_update_std_map()...

[media] tda18271: add missing entries for qam_7 to tda18271_update_std_map() and tda18271_dump_std_map()

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>