Use maps in bazel *attribute types

This is to simplify the process of resolving label + exclude labels
across the various configuration axes we have and across the various
properties/modules that use this behavior.

Test: ci/bp2build.sh && ci/mixed_droid.sh
Change-Id: I8efae3e75ddb365384f5caaf5bb504a5206618d3
diff --git a/bp2build/testing.go b/bp2build/testing.go
index e575bc6..861f7d2 100644
--- a/bp2build/testing.go
+++ b/bp2build/testing.go
@@ -157,9 +157,11 @@
 
 		paths := bazel.MakeLabelListAttribute(android.BazelLabelForModuleSrc(ctx, m.props.Arch_paths))
 
-		for arch, props := range m.GetArchProperties(ctx, &customProps{}) {
-			if archProps, ok := props.(*customProps); ok && archProps.Arch_paths != nil {
-				paths.SetValueForArch(arch.Name, android.BazelLabelForModuleSrc(ctx, archProps.Arch_paths))
+		for axis, configToProps := range m.GetArchVariantProperties(ctx, &customProps{}) {
+			for config, props := range configToProps {
+				if archProps, ok := props.(*customProps); ok && archProps.Arch_paths != nil {
+					paths.SetSelectValue(axis, config, android.BazelLabelForModuleSrc(ctx, archProps.Arch_paths))
+				}
 			}
 		}