[segment] Remove unused function

Also move its comment on seg_data to other relavant function.

Change-Id: I5d3282040862cd09565b9d4f7baadf0124b64823

av1/common/seg_common.c

@@ -52,6 +52,17 @@ int av1_is_segfeature_signed(SEG_LVL_FEATURES feature_id) {
   return seg_feature_data_signed[feature_id];
 }
 
+// The 'seg_data' given for each segment can be either deltas (from the default
+// value chosen for the frame) or absolute values.
+//
+// Valid range for abs values is (0-127 for MB_LVL_ALT_Q), (0-63 for
+// SEGMENT_ALT_LF)
+// Valid range for delta values are (+/-127 for MB_LVL_ALT_Q), (+/-63 for
+// SEGMENT_ALT_LF)
+//
+// abs_delta = SEGMENT_DELTADATA (deltas) abs_delta = SEGMENT_ABSDATA (use
+// the absolute values given).
+
 void av1_set_segdata(struct segmentation *seg, int segment_id,
                      SEG_LVL_FEATURES feature_id, int seg_data) {
   if (seg_data < 0) {

av1/encoder/segmentation.c

@@ -32,12 +32,6 @@ void av1_disable_segmentation(struct segmentation *seg) {
   seg->update_data = 0;
 }
 
-void av1_set_segment_data(struct segmentation *seg, int8_t *feature_data,
-                          unsigned char abs_delta) {
-  seg->abs_delta = abs_delta;
-
-  memcpy(seg->feature_data, feature_data, sizeof(seg->feature_data));
-}
 void av1_disable_segfeature(struct segmentation *seg, int segment_id,
                             SEG_LVL_FEATURES feature_id) {
   seg->feature_mask[segment_id] &= ~(1 << feature_id);

av1/encoder/segmentation.h

@@ -27,19 +27,6 @@ void av1_disable_segfeature(struct segmentation *seg, int segment_id,
 void av1_clear_segdata(struct segmentation *seg, int segment_id,
                        SEG_LVL_FEATURES feature_id);
 
-// The values given for each segment can be either deltas (from the default
-// value chosen for the frame) or absolute values.
-//
-// Valid range for abs values is (0-127 for MB_LVL_ALT_Q), (0-63 for
-// SEGMENT_ALT_LF)
-// Valid range for delta values are (+/-127 for MB_LVL_ALT_Q), (+/-63 for
-// SEGMENT_ALT_LF)
-//
-// abs_delta = SEGMENT_DELTADATA (deltas) abs_delta = SEGMENT_ABSDATA (use
-// the absolute values given).
-void av1_set_segment_data(struct segmentation *seg, int8_t *feature_data,
-                          unsigned char abs_delta);
-
 void av1_choose_segmap_coding_method(AV1_COMMON *cm, MACROBLOCKD *xd);
 
 void av1_reset_segment_features(AV1_COMMON *cm);