Disable bazel for riscv_64

This product is experimental and unsupported for Bazel at this time

Test: lunch aosp_riscv64-userdebug && m nothing
Test: lunch aosp_arm64-userdebug && m nothing
Change-Id: I761afb9524f1008f9d5472d2de19bb84342e9e29

android/test_config.go

@@ -62,6 +62,7 @@ func TestConfig(buildDir string, env map[string]string, bp string, fs map[string
 		TestAllowNonExistentPaths: true,
 
 		BazelContext:              noopBazelContext{},
+		BuildMode:                 BazelProdMode,
 		mixedBuildDisabledModules: make(map[string]struct{}),
 		mixedBuildEnabledModules:  make(map[string]struct{}),
 	}