Revert "h26xparse: Resend PPS/SPS after seek"

This reverts commit fe116092cdcda0d1d100e1dbbc4577cd9e4e074a.
Our video decoder needn't SPS/PPS after seek. The commit will cause
below stream seek hang.
SHAVectors/H265Dec/Conformance/TS/HEVC_640x360_AACLC_44.1Khz_2ch.ts
SHAVectors/H265Dec/Conformance/MKV/HEVC_848x480_24fps_MP2_48Khz_2ch_320Kbps_Sintel-Trailer.mkv

upstream status: imx specific
diff --git a/gst/videoparsers/gsth264parse.c b/gst/videoparsers/gsth264parse.c
index 7751ea2..a39b801 100644
--- a/gst/videoparsers/gsth264parse.c
+++ b/gst/videoparsers/gsth264parse.c
@@ -2881,7 +2881,6 @@
     case GST_EVENT_FLUSH_STOP:
       h264parse->dts = GST_CLOCK_TIME_NONE;
       h264parse->ts_trn_nb = GST_CLOCK_TIME_NONE;
-      h264parse->push_codec = TRUE;
 
       res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
       break;
diff --git a/gst/videoparsers/gsth265parse.c b/gst/videoparsers/gsth265parse.c
index 775cd24..da0fa60 100644
--- a/gst/videoparsers/gsth265parse.c
+++ b/gst/videoparsers/gsth265parse.c
@@ -2433,7 +2433,7 @@
       break;
     }
     case GST_EVENT_FLUSH_STOP:
-      h265parse->push_codec = TRUE;
+
       res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
       break;
     case GST_EVENT_SEGMENT: