h264enc: support VideoConfigTypeAVCIntraPeriod
h264enc: support VideoConfigTypeAVCIntraPeriod

it gives client more option on bitrate control

skibey/libyami,TangXinT/libyami,BtbN/libyami,tiagovignatti/libyami,andyLiuChina/libyami,lizhong1008/libyami,tiagovignatti/libyami,sbianti/libyami,clearlylin/libyami,wlin70/libyami,clearlylin/libyami,xuguangxin/libyami,halleyzhao/libyami,tiagovignatti/libyami,zhaobob/libyami,lubing521/libyami,dspmeng/libyami,wlin70/libyami,zhongcong/libyami,lubing521/libyami,andyLiuChina/libyami,mdnavare/libyami,mdnavare/libyami,chivakker/libyami,lizhong1008/libyami,dspmeng/libyami,yizhouwei/libyami,seanvk/libyami,mdnavare/libyami,andyLiuChina/libyami,edgar1992/libyami,YuJiankang/libyami,wlin70/libyami,stripes416/libyami,BtbN/libyami,sbianti/libyami,BtbN/libyami,lizhong1008/libyami,uartie/libyami,sbianti/libyami,luokunrock/libyami,ratin3/libyami,TangXinT/libyami,pombreda/libyami,stripes416/libyami,lubing521/libyami,01org/libyami,dspmeng/libyami,bluceldg/libyami,halleyzhao/libyami,UIKit0/libyami,pombreda/libyami,zhaobob/libyami,mdnavare/libyami,dhutching/libyami,sbianti/libyami,stripes416/libyami,skibey/libyami,zhongcong/gst-omx,dhutching/libyami,halleyzhao/libyami,YuJiankang/libyami,xuguangxin/libyami,ratin3/libyami,seanvk/libyami,halleyzhao/libyami,UIKit0/libyami,ratin3/libyami,pombreda/libyami,zhongcong/libyami,clearlylin/libyami,andyLiuChina/libyami,seanvk/libyami,xuguangxin/libyami,luokunrock/libyami,luokunrock/libyami,changzhix/libyami-1,bluceldg/libyami,dhutching/libyami,zhongcong/libyami,changzhix/libyami-1,uartie/libyami,chivakker/libyami,zhongcong/libyami,zhongcong/gst-omx,skibey/libyami,changzhix/libyami-1,ratin3/libyami,edgar1992/libyami,YuJiankang/libyami,zhongcong/gst-omx,yizhouwei/libyami,01org/libyami,01org/libyami,xuguangxin/libyami,pombreda/libyami,bluceldg/libyami,UIKit0/libyami,zhaobob/libyami,TangXinT/libyami,wlin70/libyami,yizhouwei/libyami,bluceldg/libyami,luokunrock/libyami,edgar1992/libyami,chivakker/libyami,BtbN/libyami,uartie/libyami