When enumerating PCI devices to find GPUs, only filter on the base
class. This allows devices with class PCI_CLASS_DISPLAY_OTHER to be
found.

Bug: b/178748337
Change-Id: Ia0cd29dddc49a16428da16c1ef1b94040c1221f7
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2817973Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
(cherry picked from commit 0615bbde)
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2833496