Convert SetProvider to generic providers API

Convert all of the callers of SetProvider to use the type-safe
android.SetProvider API.

Bug: 316410648
Test: builds
Change-Id: If58f4b5355264ddab2045bc3591a4eac19cd58fc
diff --git a/testing/test_spec.go b/testing/test_spec.go
index 2a05456..02f6c60 100644
--- a/testing/test_spec.go
+++ b/testing/test_spec.go
@@ -119,7 +119,7 @@
 	}
 	android.WriteFileRule(ctx, intermediatePath, string(protoData))
 
-	ctx.SetProvider(
+	android.SetProvider(ctx,
 		TestSpecProviderKey, TestSpecProviderData{
 			IntermediatePath: intermediatePath,
 		},