Add TEST_N pinmux for channel 6 and 7 of the i2s output
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Reviewed-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>