ASoC: qcom: lpass-cpu: fix warning on symbol scope

ASoC: qcom: lpass-cpu: fix warning on symbol scope

This patch fixes below warning when module is compiled with W=1 C=1

lpass-cpu.c:677:22: warning: symbol 'lpass_hdmi_regmap_config'
was not declared. Should it be static?

Fixes: f3fe4960dd38 ("ASoC: qcom: Add support for lpass hdmi driver")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20201105114100.18647-1-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>