asoc: Kona: add support to send island mode config for VA usecase

Currently audio driver doesn't send island mode config to ADSP
to set the LPI mode, which causes ADSP to remain in Non-LPI mode.
Fix it by adding support in Kona machine driver to send island
mode config for VA usecase.

Change-Id: I2294950055cb74a1a9d3ee630e74f63eb6435e7b
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>