intel/pci_ids: Consistently use lowercase

Lina Versace requested to merge linyaa/mesa:intel-lowercase-pci-ids into main

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/.

Edited by Lina Versace

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