Enable AMD Audio CoProcessor IP support

configname: CONFIG_DRM_AMD_ACP

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>ACP (Audio CoProcessor) Configuration
└─>Enable AMD Audio CoProcessor IP support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Choose this option to enable ACP IP support for AMD SOCs.
This adds the ACP (Audio CoProcessor) IP driver and wires
it up into the amdgpu driver. The ACP block provides the DMA
engine for the i2s-based ALSA driver. It is required for audio
on APUs which utilize an i2s codec.