Use libhex

Rather than our own wheel.

Test: TH
Change-Id: Ied0d5d492597b247e7da561e73e318271186bbb0
diff --git a/compos/Android.bp b/compos/Android.bp
index 19123dd..b840506 100644
--- a/compos/Android.bp
+++ b/compos/Android.bp
@@ -14,6 +14,7 @@
         "libanyhow",
         "libbinder_rs",
         "libcompos_common",
+        "libhex",
         "liblibc",
         "liblog_rust",
         "libminijail_rust",