Add conf files for -device qmake switch. It consists of two common
pre/post includes for FreeBSD-base device. "freebsd-generic-clang"
-device option for generic cross-compilation target, with bsdfb as
default platform and freebsd-rasp-pi-clang option for Raspberry Pi
(up to version 2) with OpenGL ES2 (eglfs) support
Change-Id: I45d91c0512f60f2be438ce46e0485844c341188a
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
