Mark libbspatch as recovery_available for update_engine_sideload

Test: build update_engine_sideload
Change-Id: I75fce6c7da055e6e7a08d98530de15536bc1b964
diff --git a/Android.bp b/Android.bp
index 3f49b4a..d20b5cf 100644
--- a/Android.bp
+++ b/Android.bp
@@ -33,6 +33,7 @@
 cc_library_static {
     name: "libbspatch",
     defaults: ["bsdiff_defaults"],
+    recovery_available: true,
 
     srcs: [
         "brotli_decompressor.cc",