Encryptedstore: Use microdroid specific mke2fs target

mke2fs.microdroid target enables bootstrap: true. This way mk2fs can
format the storage before APEXes are activated.

Test: atest MicrodroidTests#encryptedStorageAvailable
Bug: 238179332
Change-Id: I2f2bfdde031ec1e1f158bb100027466e61cdcf4b
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index af6031a..8723a7b 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -83,7 +83,7 @@
         "microdroid_manifest",
         "microdroid_plat_sepolicy_and_mapping.sha256",
         "microdroid_property_contexts",
-        "mke2fs",
+        "mke2fs.microdroid",
 
         // TODO(b/195425111) these should be added automatically
         "libcrypto", // used by many (init_second_stage, microdroid_manager, toybox, etc)