Integrate gen_notice with Make for dist.

Most exempt module types have no output. Support exempt module types
with output by requiring they must be 0p and have no license metadata.

Disallow `licenses: []` property on gen_notice.

Test: m cts dist

Change-Id: Ic992bd6420fa6898495866eac43495002ef4b6c8
Merged-in: Ic992bd6420fa6898495866eac43495002ef4b6c8
diff --git a/android/androidmk.go b/android/androidmk.go
index 006e43d..18e3e7a 100644
--- a/android/androidmk.go
+++ b/android/androidmk.go
@@ -366,7 +366,9 @@
 	// Collate the contributions this module makes to the dist.
 	distContributions := &distContributions{}
 
-	distContributions.licenseMetadataFile = amod.licenseMetadataFile
+	if !exemptFromRequiredApplicableLicensesProperty(mod.(Module)) {
+		distContributions.licenseMetadataFile = amod.licenseMetadataFile
+	}
 
 	// Iterate over this module's dist structs, merged from the dist and dists properties.
 	for _, dist := range amod.Dists() {
@@ -458,10 +460,12 @@
 		ret = append(ret, fmt.Sprintf(".PHONY: %s\n", d.goals))
 		// Create dist-for-goals calls for each of the copy instructions.
 		for _, c := range d.copies {
-			ret = append(
-				ret,
-				fmt.Sprintf("$(if $(strip $(ALL_TARGETS.%s.META_LIC)),,$(eval ALL_TARGETS.%s.META_LIC := %s))\n",
-					c.from.String(), c.from.String(), distContributions.licenseMetadataFile.String()))
+			if distContributions.licenseMetadataFile != nil {
+				ret = append(
+					ret,
+					fmt.Sprintf("$(if $(strip $(ALL_TARGETS.%s.META_LIC)),,$(eval ALL_TARGETS.%s.META_LIC := %s))\n",
+						c.from.String(), c.from.String(), distContributions.licenseMetadataFile.String()))
+			}
 			ret = append(
 				ret,
 				fmt.Sprintf("$(call dist-for-goals,%s,%s:%s)\n", d.goals, c.from.String(), c.dest))