disable pixel6 for VertexAttributeTestES31 tests

Bug: angleproject:7770
Change-Id: Icc5d750ab222d2757e9551cbe3c2e7816b77a040
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3971009
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Solti Ho <solti@google.com>
diff --git a/src/tests/angle_end2end_tests_expectations.txt b/src/tests/angle_end2end_tests_expectations.txt
index 0ae6dab..aaabab3 100644
--- a/src/tests/angle_end2end_tests_expectations.txt
+++ b/src/tests/angle_end2end_tests_expectations.txt
@@ -76,6 +76,8 @@
 7699 WIN INTEL VULKAN : FramebufferTest_ES31.RenderingLimitToDefaultFBOSizeWithNoAttachments/* = SKIP
 7770 WIN INTEL VULKAN : VertexAttributeTestES31.MismatchingSignsChangingAttributeType/* = SKIP
 7770 WIN INTEL VULKAN : VertexAttributeTestES31.MismatchingSignsChangingProgramType/* = SKIP
+7770 PIXEL6 VULKAN : VertexAttributeTestES31.MismatchingSignsChangingAttributeType/* = SKIP
+7770 PIXEL6 VULKAN : VertexAttributeTestES31.MismatchingSignsChangingProgramType/* = SKIP
 
 234602034 WIN INTEL D3D9 : ImageTest.SourceCubeAndSameTargetTextureWithEachCubeFace/* = SKIP
 234602034 WIN NVIDIA D3D9 : ImageTest.SourceCubeAndSameTargetTextureWithEachCubeFace/* = SKIP