common: linux: add support for DRM_FORMAT_NV12 In DrmFourCCFormatToVkFormats convert DRM_FORMAT_NV12 to VK_FORMAT_G8_B8R8_2PLANE_420_UNORM. DmaBufImageSiblingVkLinux can already consume it. BUG: b/277798516 Change-Id: I3173763101cf926fb2277651918631ec4de76e96 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4604507 Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>