The pci ids used a mixture of uppercase and lowercase, even in the same
file. The inconsistency introduces unnecessary complexity in regular
expressions.
Diff made in vim with `%s/\v(CHIPSET\()([^,]+)/\1\L\2\E/`.
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>`
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25257>
15fcfbe046