Vulkan: Turn on cubemap arrays for Qualcomm The feature works on Pixel 3 and later, so only disable it on Pixel 2. Bug: angleproject:5143 Change-Id: I824fc9ea71cb612fd99e23b7f37a1a3c278d92aa Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2855218 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Cody Northrop <cnorthrop@google.com>