linux-bbone: use our preprocessor for dt files to fix build on latest fedora
linux-bbone: use our preprocessor for dt files to fix build on latest fedora

It might just be a matter of time till this error comes back

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@googlemail.com>

schnitzeltony/meta-bbone