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
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D46300

(cherry picked from commit 51cb6f5244575e1abc008598e90eb35452ffbcac)