ASoC: lpass-platform: use devm_regmap_field_bulk_alloc

use new devm_regmap_field_bulk_alloc to allocate fields as
it make the code more readable!

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
Link: https://lore.kernel.org/r/20200925164856.10315-3-srinivas.kandagatla@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>