BM64 sample frequency

typedef enum {
  DRV_BM64_SAMPLEFREQ_8000 = 0,
  DRV_BM64_SAMPLEFREQ_12000,
  DRV_BM64_SAMPLEFREQ_16000,
  DRV_BM64_SAMPLEFREQ_24000,
  DRV_BM64_SAMPLEFREQ_32000,
  DRV_BM64_SAMPLEFREQ_48000,
  DRV_BM64_SAMPLEFREQ_44100,
  DRV_BM64_SAMPLEFREQ_88000,
  DRV_BM64_SAMPLEFREQ_96000
} DRV_BM64_SAMPLE_FREQUENCY;