MMFMWK-8216 H1 Encoder 1080p video is not smooth

The default gop size of encoder is 15 while the default frame rate is 30,
Change the default gop size to 30 as well.

Signed-off-by: xiahong.bao <xiahong.bao@nxp.com>
diff --git a/plugins/vpu/gstvpuenc.c b/plugins/vpu/gstvpuenc.c
index f2fc4ec..e76a05b 100755
--- a/plugins/vpu/gstvpuenc.c
+++ b/plugins/vpu/gstvpuenc.c
@@ -46,7 +46,11 @@
 #include "gstvpuenc.h"
 
 #define DEFAULT_BITRATE 0
+#ifdef USE_H1_ENC
+#define DEFAULT_GOP_SIZE 30
+#else
 #define DEFAULT_GOP_SIZE 15
+#endif
 #define DEFAULT_QUANT -1
 #define DEFAULT_H264_QUANT 35
 #define DEFAULT_MPEG4_QUANT 15