Homogenize configuration option name.

Rename '--enable-aom-highbitdepth' to '--enable-highbitdepth'

Change-Id: I1de13c3508c30c552532993419d8ace326142ab6
diff --git a/aom_dsp/quantize.h b/aom_dsp/quantize.h
index 67e3b5e..fe49b83 100644
--- a/aom_dsp/quantize.h
+++ b/aom_dsp/quantize.h
@@ -45,7 +45,7 @@
                       uint16_t *eob_ptr, const int16_t *scan,
                       const int16_t *iscan, const qm_val_t *qm_ptr,
                       const qm_val_t *iqm_ptr);
-#if CONFIG_AOM_HIGHBITDEPTH
+#if CONFIG_HIGHBITDEPTH
 void aom_highbd_quantize_dc(const tran_low_t *coeff_ptr, int n_coeffs,
                             int skip_block, const int16_t *round_ptr,
                             const int16_t quant_ptr, tran_low_t *qcoeff_ptr,
@@ -72,7 +72,7 @@
                              const int16_t *dequant_ptr, uint16_t *eob_ptr,
                              const int16_t *scan, const int16_t *iscan,
                              const qm_val_t *qm_ptr, const qm_val_t *iqm_ptr);
-#endif  // CONFIG_AOM_HIGHBITDEPTH
+#endif  // CONFIG_HIGHBITDEPTH
 
 #else  // CONFIG_AOM_QM
 
@@ -90,7 +90,7 @@
                            tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr,
                            const int16_t dequant_ptr, uint16_t *eob_ptr);
 #endif  // CONFIG_TX64X64
-#if CONFIG_AOM_HIGHBITDEPTH
+#if CONFIG_HIGHBITDEPTH
 void aom_highbd_quantize_dc(const tran_low_t *coeff_ptr, int n_coeffs,
                             int skip_block, const int16_t *round_ptr,
                             const int16_t quant_ptr, tran_low_t *qcoeff_ptr,
@@ -110,7 +110,7 @@
                                   tran_low_t *dqcoeff_ptr,
                                   const int16_t dequant_ptr, uint16_t *eob_ptr);
 #endif  // CONFIG_TX64X64
-#endif  // CONFIG_AOM_HIGHBITDEPTH
+#endif  // CONFIG_HIGHBITDEPTH
 #endif  // CONFIG_AOM_QM
 
 #ifdef __cplusplus