config: make partialCompileFlags visible

Other modules need to check partialCompileFlags values.

Bug: b/374975543
Test: manual, TH
Change-Id: Id8dcbc64506561cb9d1c26e7b53f193d306e0562
diff --git a/android/config_test.go b/android/config_test.go
index 4fdcc9c..4bdf05f 100644
--- a/android/config_test.go
+++ b/android/config_test.go
@@ -214,12 +214,12 @@
 }
 
 func (p partialCompileFlags) updateEnabled(value bool) partialCompileFlags {
-	p.enabled = value
+	p.Enabled = value
 	return p
 }
 
 func (p partialCompileFlags) updateUseD8(value bool) partialCompileFlags {
-	p.use_d8 = value
+	p.Use_d8 = value
 	return p
 }