conf/layer.conf: Add qt packages to list of API stable recipes
conf/layer.conf: Add qt packages to list of API stable recipes

Issue: CR-1099768

qtbase and others may change depending on libmali, but they are API stable.

Signed-off-by: Mark Hatle <41765ab18fb75e64ff0efe27f2ebcdb2d6f7e44e@xilinx.com>

Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux