ASoC: Enable config for ASphere

Enable required config CONFIG_QTI_PP_AUDIOSPHERE
for audio sphere feature to work on
sdm450 and sdm670 targets.

Change-Id: Iaa897f9357edd5a3d2e5c2b2ca96e8a26426c65f
Signed-off-by: Soumya Managoli <smanag@codeaurora.org>