Disable the usage of VK_EXT_legacy_dithering Disable the usage of extension VK_EXT_legacy_dithering on ARM until the bugs in this extension is addressed. Bug: b/293136916 Bug: b/292282210 Change-Id: I1a548a2f6c44a78f8c66f706588a9985326217cf Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4718306 Reviewed-by: Solti Ho <solti@google.com> Commit-Queue: Solti Ho <solti@google.com> Reviewed-by: Kaiyi Li <kaiyili@google.com>