Build TF-A with Trusty SPD.

This implements a subset of FF-A, which we can use to test FF-A memory
sharing with the secure world.

Bug: 132429380
Change-Id: Ic8874cf02688c70680a1568792c838be7666d70f
diff --git a/linux-aarch64/arm-trusted-firmware/METADATA b/linux-aarch64/arm-trusted-firmware/METADATA
index c24d883..21a0894 100644
--- a/linux-aarch64/arm-trusted-firmware/METADATA
+++ b/linux-aarch64/arm-trusted-firmware/METADATA
@@ -8,9 +8,9 @@
   }
   url {
     type: GIT
-    value: "https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git"
+    value: "https://android.googlesource.com/trusty/external/trusted-firmware-a/"
   }
-  version: "2.2-411-gb3a28c6ea"
-  last_upgrade_date { year: 2020 month: 1 day: 22 }
+  version: "2.2-771-g2d7b074e2"
+  last_upgrade_date { year: 2020 month: 8 day: 18 }
   license_type: NOTICE
 }