Upgrade KeyMint version

Upgrade the KeyMint version the framework depends on to V2 (from V1).

This is necessary for the new constants related to Curve 25519.

Bug: 194359292
Test: That it compiles.
Change-Id: I95191fd09b138bf3ba1cbb50534fdbdcf36d1596
diff --git a/Android.bp b/Android.bp
index ee5db70..1c4f10e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -110,7 +110,7 @@
 
         // AIDL sources from external directories
         ":android.hardware.graphics.common-V3-java-source",
-        ":android.hardware.security.keymint-V1-java-source",
+        ":android.hardware.security.keymint-V2-java-source",
         ":android.hardware.security.secureclock-V1-java-source",
         ":android.hardware.tv.tuner-V1-java-source",
         ":android.security.apc-java-source",