Use libhex to encode hex string in libs/apkverify/

Bug: 239413416
Test: libapkverify.test, libapkverify.integration_test
Change-Id: I21285b1528f6eb8806a594f53b7b1045255af3b5
Signed-off-by: Tanmoy Mollik <triploblastic@google.com>
diff --git a/libs/apkverify/Android.bp b/libs/apkverify/Android.bp
index 1862820..e556842 100644
--- a/libs/apkverify/Android.bp
+++ b/libs/apkverify/Android.bp
@@ -12,6 +12,7 @@
         "libanyhow",
         "libbyteorder",
         "libbytes",
+        "libhex",
         "liblog_rust",
         "libnum_traits",
         "libopenssl",
@@ -33,7 +34,6 @@
     name: "libapkverify.test",
     defaults: ["libapkverify.defaults"],
     test_suites: ["general-tests"],
-    rustlibs: ["libhex"],
     data: ["tests/data/*"],
 }