Don't write license data to Android-${TARGET_PRODUCT}.mk

All the necessary license data is already propagated through the license
metadata file, and the entries in Android-${TARGET_PRODUCT}.mk are not
used.  Remove them, which should both reduce the size and parsing cost
of the Android-${TARGET_PRODUCT}.mk file and also removes a variable
that changes when dependencies are added or removed, which will
eventually allow running kati less often.

Bug: 309006256
Test: No change to out/Android-aosp_cf_x86_64_phone.ninja
Change-Id: Idfeb6fd10d77497ca274f8e74fe8e994ce1cafe6

phony/phony.go

@@ -52,7 +52,6 @@ func (p *phony) AndroidMk() android.AndroidMkData {
 			fmt.Fprintln(w, "\ninclude $(CLEAR_VARS)", " # phony.phony")
 			fmt.Fprintln(w, "LOCAL_PATH :=", moduleDir)
 			fmt.Fprintln(w, "LOCAL_MODULE :=", name)
-			data.Entries.WriteLicenseVariables(w)
 			if p.Host() {
 				fmt.Fprintln(w, "LOCAL_IS_HOST_MODULE := true")
 			}