packetizer: hevc: fix small vcl regression
packetizer: hevc: fix small vcl regression

Wrong 7 bytes test + 4 bytes prefix > 8 bytes nal
WPP_A_ericsson_MAIN10_2.bit

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc