msm8974: Disable multiple offload support

 * Disable multiple offload support in the stable branch until we
   fix the issue with the offload visualizer. The issue is that
   the visualizer is hardcoded for a single AFE_PCM_RX path, and
   we need to pass this up from the HAL for multiple offload.
 * Revert this when the issue is fixed, as multi-offload can improve
   power consumption in certain use cases.

Change-Id: Ife712dfe47d24db361949d3736156276f5f6e0a9