ASoC: mdm9615: Add DTMF FE to the machine driver
ASoC: mdm9615: Add DTMF FE to the machine driver

Add support to generate DTMF using DSP's audio front-end (AFE).
Add DTMF FE to the machine driver to enable DTMF generation.

Change-Id: Ied11b4aab1e1f9b5ac54b591ef50a8c69f913ea6
Signed-off-by: Shiv Maliyappanahalli <ac787d8f09a6823214d7ee5f9172cecd4adaf7cb@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas