zybo-linux-bd-zynq7: Enable required kernel drivers
zybo-linux-bd-zynq7: Enable required kernel drivers

Enable DRM, SND, KP-GPIO and V4L2 kconfigs

Signed-off-by: Jason Wu <7d4112ffa20457d29dd2726d16082ed426627347@gmail.com>
Signed-off-by: Nathan Rossi <2e8aa918660411855c6d44d5bb2da677aa033255@nathanrossi.com>

Xilinx/meta-xilinx,nathanrossi/meta-xilinx,Xilinx/meta-xilinx,nathanrossi/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,nathanrossi/meta-xilinx,Xilinx/meta-xilinx,nathanrossi/meta-xilinx