av1: normalize aom_enc_frame_flags_t usage

quiets -Wshorten-64-to-32 warnings

ported from libvpx:
710483308 vp9: normalize vpx_enc_frame_flags_t usage

Change-Id: Ice037acb675d1d81bfedf2dfcfa91a8a29a19dfd

av1/encoder/encoder.c

@@ -5156,7 +5156,7 @@ static void check_initial_width(AV1_COMP *cpi,
   }
 }
 
-int av1_receive_raw_frame(AV1_COMP *cpi, unsigned int frame_flags,
+int av1_receive_raw_frame(AV1_COMP *cpi, aom_enc_frame_flags_t frame_flags,
                           YV12_BUFFER_CONFIG *sd, int64_t time_stamp,
                           int64_t end_time) {
   AV1_COMMON *const cm = &cpi->common;

av1/encoder/encoder.h

@@ -677,7 +677,7 @@ void av1_change_config(AV1_COMP *cpi, const AV1EncoderConfig *oxcf);
 
 // receive a frames worth of data. caller can assume that a copy of this
 // frame is made and not just a copy of the pointer..
-int av1_receive_raw_frame(AV1_COMP *cpi, unsigned int frame_flags,
+int av1_receive_raw_frame(AV1_COMP *cpi, aom_enc_frame_flags_t frame_flags,
                           YV12_BUFFER_CONFIG *sd, int64_t time_stamp,
                           int64_t end_time_stamp);
 

av1/encoder/lookahead.c

@@ -88,7 +88,7 @@ int av1_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
 #if CONFIG_AOM_HIGHBITDEPTH
                        int use_highbitdepth,
 #endif
-                       unsigned int flags) {
+                       aom_enc_frame_flags_t flags) {
   struct lookahead_entry *buf;
 #if USE_PARTIAL_COPY
   int row, col, active_end;

av1/encoder/lookahead.h

@@ -25,7 +25,7 @@ struct lookahead_entry {
   YV12_BUFFER_CONFIG img;
   int64_t ts_start;
   int64_t ts_end;
-  unsigned int flags;
+  aom_enc_frame_flags_t flags;
 };
 
 // The max of past frames we want to keep in the queue.
@@ -77,7 +77,7 @@ int av1_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
 #if CONFIG_AOM_HIGHBITDEPTH
                        int use_highbitdepth,
 #endif
-                       unsigned int flags);
+                       aom_enc_frame_flags_t flags);
 
 /**\brief Get the next source buffer to encode
  *