Build microdroid-vbmeta and -vbmeta_system

Bug: 180676957
Test: m microdroid-vbmeta microdroid-vbmeta_system
avbtool info_image --image <built_image>

Test: atest MicrodroidHostTestCases

Change-Id: Ifa3dae5080e68faca921b7817db98548727eefc4
diff --git a/tests/hostside/Android.bp b/tests/hostside/Android.bp
index e07459a..c030e8d 100644
--- a/tests/hostside/Android.bp
+++ b/tests/hostside/Android.bp
@@ -14,6 +14,8 @@
         ":microdroid_uboot_env",
         ":cuttlefish_crosvm_bootloader",
         ":MicrodroidHostTestCase_EmptyImage",
+        ":microdroid_vbmeta",
+        ":microdroid_vbmeta_system",
     ],
 }