Depend on KeyMint HAL via default

This allows for easier bumping of the KeyMint version level.

At the moment this change should have no effect: the same dependency
is used, just reached via a default rather than explicitly.

However, when the KeyMint version increases in the near future, using
this default should mean that no change is needed here: the default
definition will change to -V2 and this will be referenced here.

Test: TreeHugger
Change-Id: If8ebdb26289bb9d862ac160d3deea0de8fcc4d71
diff --git a/microdroid/keymint/Android.bp b/microdroid/keymint/Android.bp
index a0bbaf4..7915ada 100644
--- a/microdroid/keymint/Android.bp
+++ b/microdroid/keymint/Android.bp
@@ -14,8 +14,10 @@
         "-Wall",
         "-Wextra",
     ],
+    defaults: [
+        "keymint_use_latest_hal_aidl_ndk_shared",
+    ],
     shared_libs: [
-        "android.hardware.security.keymint-V1-ndk",
         "lib_android_keymaster_keymint_utils",
         "libbase",
         "libbinder_ndk",