[meta-freescale] mfw_isink vssconfig

[Janis Coders]

Hi, I was playing with mfw_isink for a while and had few problems, but 
seems like they can be fixed by modifying vssconfig file.
By default in /usr/share/vssconfig (which is provided by 
gst-fsl-plugins) fb_num value is 1. Setting this value to 2 makes 
mfw_isink work. I am no graphics expert, so this must be tested with x11 
and qt, but I guess this should be the default value, because then 
gstreamer isink works out of the box.
This is in dora branch with imx53qsb (not sure about imx6).
What do you think, can someone test this?

$ export VSALPHA=1
$ gst-launch mfw_v4lsrc ! mfw_isink