ASoC: hdac_hdmi: Remove the unused 'timeout' variable

Commit b2047e99 ("ASoC: hdac_hdmi: add link management")
introuduced the following build warning:

sound/soc/codecs/hdac_hdmi.c:1721:16: warning: unused variable 'timeout' [-Wunused-variable]

Remove the unused 'timeout' variable.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>