Extract root hash instead of public key from microdroid vendor image

Bug: 285855436
Test: atest virtualizationmanager_device_test
Test: atest MicrodroidTests#bootsWithVendorPartition
Test: adb shell /apex/com.android.virt/bin/vm run-microdroid --vendor /vendor/etc/avf/microdroid/microdroid_vendor.img

Change-Id: I15bae3b53e52311ecbea644a6e78ab81e19f443e
diff --git a/virtualizationmanager/Android.bp b/virtualizationmanager/Android.bp
index 88e9c70..60c94fc 100644
--- a/virtualizationmanager/Android.bp
+++ b/virtualizationmanager/Android.bp
@@ -38,6 +38,7 @@
         "libclap",
         "libcommand_fds",
         "libdisk",
+        "libhex",
         "libhypervisor_props",
         "liblazy_static",
         "liblibc",