radv: enable shaderGatherImageExtended

Thanks to Ilia's patch this works fine on radv.

No regressions in CTS, all enabled tests pass.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
index 7a64cc4..173d43d 100644
--- a/src/amd/vulkan/radv_device.c
+++ b/src/amd/vulkan/radv_device.c
@@ -395,7 +395,7 @@
 		.vertexPipelineStoresAndAtomics           = true,
 		.fragmentStoresAndAtomics                 = true,
 		.shaderTessellationAndGeometryPointSize   = true,
-		.shaderImageGatherExtended                = false,
+		.shaderImageGatherExtended                = true,
 		.shaderStorageImageExtendedFormats        = false,
 		.shaderStorageImageMultisample            = false,
 		.shaderUniformBufferArrayDynamicIndexing  = true,