tools/sdiodevs2h.awk: adjust defined named for vendor and device IDs

Generate defined names which match the ones in the Linux drivers (a lot more);
given we are likely to have drivers only based on those one way or another
there is absolutely no reason to fight over differently generated names
for device and vendor IDs.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D46300