data/rauc.service.in: use 'RAUC' instead of 'Rauc' in description
data/rauc.service.in: use 'RAUC' instead of 'Rauc' in description

This is how we write it and it should be consistent.

Signed-off-by: Enrico Jorns <a2e5f936c390f36494e46e71bcfbe365bb1e8c49@pengutronix.de>

ejoerns/rauc,jluebbe/rauc,ejoerns/rauc,jluebbe/rauc,rauc/rauc,rauc/rauc,jluebbe/rauc,rauc/rauc,ejoerns/rauc