Lift BazelHandler interface into android/

Because it's commonly useful and not cc/ specific
Also export GenerateBazelBuildActions and update uses

Test: Existing tests pass
Change-Id: Ibc6858bb1129afba181a7686dda432defe33b00d
diff --git a/cc/library.go b/cc/library.go
index 51cba20..b2360e9 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -556,7 +556,7 @@
 }
 
 type ccLibraryBazelHandler struct {
-	bazelHandler
+	android.BazelHandler
 
 	module *Module
 }
@@ -642,7 +642,7 @@
 	return android.OptionalPathForPath(android.PathForBazelOut(ctx, tocFile))
 }
 
-func (handler *ccLibraryBazelHandler) generateBazelBuildActions(ctx android.ModuleContext, label string) bool {
+func (handler *ccLibraryBazelHandler) GenerateBazelBuildActions(ctx android.ModuleContext, label string) bool {
 	bazelCtx := ctx.Config().BazelContext
 	ccInfo, ok, err := bazelCtx.GetCcInfo(label, ctx.Arch().ArchType)
 	if err != nil {