ASoC: tegra-alt: Enable DCR and DMIC Boost Gain

ASoC: tegra-alt: Enable DCR and DMIC Boost Gain

 - DCR filter enabled
 - Mixer control "Boost Gain" provided (with 100x factor); gain
   is applied in LP filter configured for passthrough

Bug 200108603

Change-Id: If1e3cfa8cc0b5a3a186ebd6ecdeba9a5a3cc2ef3
Signed-off-by: Viswanath L <viswanathl@nvidia.com>
Reviewed-on: http://git-master/r/802680
(cherry picked from commit 4498fa1cfab4e121796ff20c36fe3c8398ddd1a0)
Reviewed-on: http://git-master/r/805862
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sumit Bhattacharya <sumitb@nvidia.com>