uhcalltest überApp micro-hypervisor extension

The following instructions show how the example überApp uxmhf-rpi3/rgapps/linux/rgapp-uhcalltest (to test hypercalls) is built.

1. Building uhcallkmod on development system
   1. cd rgapps/linux/rgapp-uhcallkmod
   2. ./build.sh ~/linux ~/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/
   3. cp ./uhcallkmod.ko ~/uxmhf-rpi3-staging/.
2. Building uhcalltest on development system
   1. cd rgapps/linux
   2. make -w all
   3. cd rgapp-uhcalltest
   4. make -w all
   5. cp ./uhcalltest ~/uxmhf-rpi3-staging/.