add warning about acpi parsing on master kernel
add warning about acpi parsing on master kernel

seL4/libplatsupport,winksaville/libplatsupport,agacek/util_libs,winksaville/libplatsupport,seL4/libplatsupport,agacek/util_libs,agacek/util_libs,agacek/libplatsupport,agacek/libplatsupport,agacek/util_libs