tools/sdiodevs2h.awk: introduce palias
Some of the defined names are not the direct 1:1 mapping with vendor
and device names used by Linux device drivers.
Introduce a p(roduct)alias so we can map the one device entry I came
across without much extra hassle and generate a name device drivers
know about:
palias BROADCOM_CYPRESS_43439 CYPRESS_43439
Sponsored by: The FreeBSD Foundation
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D46455
(cherry picked from commit b4ef1b1be753952a4aafa505817164624f712c37)