修复gst和mpp的layout不同导致rga对目标内存大小计算错误

[zylo117]

假如640x480的nv12帧需要转换颜色空间到rgb，因为rga所用的是类似[640, 480, 3]的layout，而gst则认为是应该是[640x3, 480]，然后gst又在这里gst_mpp_set_rga_info，把hstride: 640x3传给了rga的info。

https://github.com/JeffyCN/rockchip_mirrors/blob/b654ce25b062efebc0cb1107acd02cc811aab55a/gst/rockchipmpp/gstmpp.c#L186

rga_set_rect (&info->rect, 0, 0, width, height, hstride, vstride, rga_format);

导致rga以为目标内存有[640*3, 480, 3]那么大，也就是申请的内存的3倍大小。所以在gst中用mppvideodec转换到非nv12，nv21之外的颜色空间必然导致rga出错，比如rgb/bgr,rgba/bgra等等

修复办法就是在传给rga之前，gst把hstride除以目标颜色空间的pixel_stride，刚好gst_mpp_get_pixel_stride这个函数就是做这个的

[JeffyCN]

Hi, Thanks for the patch. It's a knowing issue that has been fixed in other packages that the RGA accepts pixel stride, i forgot to fix it here too.

I've uploaded the fix, the reason not using your version is: 1/ This is just a mirror repo, the patch needs to go through RK's internal gerrit 2/ There're other caller needs to be fixed 3/ We need to use English in commit message with a proper change-id and signed-off