[dm][refactoring] Use hex crate to encode/decode hex string

Bug: 239413416
Test: atest MicrodroidTests
Change-Id: I259cc08fc264b41df3228d01f7b89ad55c530259
diff --git a/apkdmverity/Android.bp b/apkdmverity/Android.bp
index c4c90cd..0cb8ca1 100644
--- a/apkdmverity/Android.bp
+++ b/apkdmverity/Android.bp
@@ -15,6 +15,7 @@
         "libbitflags",
         "libclap",
         "libdm_rust",
+        "libhex",
         "libitertools",
         "liblibc",
         "libnix",