Apply EnforceRROExemptedTargets in Soong

As PRODUCT_ENFORCE_RRO_EXEMPTED_TARGETS is defined in make, define it in
soong accordingly

Bug: 150820813
Test: m
Change-Id: I309482b6ad439a7602127f68f2f7ffa856b9e192
Merged-In: I309482b6ad439a7602127f68f2f7ffa856b9e192
diff --git a/android/variable.go b/android/variable.go
index 4d1b5e4..118e107 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -187,9 +187,11 @@
 	CrossHostArch          *string `json:",omitempty"`
 	CrossHostSecondaryArch *string `json:",omitempty"`
 
-	DeviceResourceOverlays     []string `json:",omitempty"`
-	ProductResourceOverlays    []string `json:",omitempty"`
-	EnforceRROTargets          []string `json:",omitempty"`
+	DeviceResourceOverlays  []string `json:",omitempty"`
+	ProductResourceOverlays []string `json:",omitempty"`
+	EnforceRROTargets       []string `json:",omitempty"`
+	// TODO(b/150820813) Some modules depend on static overlay, remove this after eliminating the dependency.
+	EnforceRROExemptedTargets  []string `json:",omitempty"`
 	EnforceRROExcludedOverlays []string `json:",omitempty"`
 
 	AAPTCharacteristics *string  `json:",omitempty"`