Auto hardware/interfaces/Android.bp

Bug: 31909444
Test: make various interfaces, mma -j
Change-Id: Ie2de39572e482415b5279110586a0cb7e5220c8e

Android.bp

@@ -1,3 +1,4 @@
+// This is an autogenerated file, do not edit.
 subdirs = [
     "benchmarks/msgq/1.0",
     "nfc/1.0",

update-makefiles.sh

@@ -17,3 +17,18 @@ for p in $packages; do
   hidl-gen -Lmakefile -r android.hardware:hardware/interfaces $p;
   hidl-gen -Landroidbp -r android.hardware:hardware/interfaces $p;
 done
+
+bp="hardware/interfaces/Android.bp"
+androidbps=$(find hardware/interfaces/*/      \
+             -name "Android.bp"               \
+             -exec dirname {} \;              \
+             | sort)
+
+echo "Updating $bp"
+
+echo "// This is an autogenerated file, do not edit." > $bp;
+echo "subdirs = [" >> $bp;
+for a in $androidbps; do
+  echo "    \"${a#*hardware/interfaces/}\"," >> $bp;
+done
+echo "]" >> $bp;