ASoC: tas5086: Improve the logic for de-emphasis sampling rate selection

Slightly improve the logic for de-emphasis sampling rate selection by break
out the loop if the rate is matched.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Mark Brown <broonie@kernel.org>