Make origin_address consistent with the address used for FVP tests.

This makes it easier to load symbols for debugging.

Change-Id: I6a092a145633550f4bf9fb3f855401c68cf2dc45
diff --git a/BUILD.gn b/BUILD.gn
index 8ec38a5..53d680b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -52,7 +52,7 @@
 
 aarch64_toolchain("aem_v8a_fvp") {
   cpu = "cortex-a57+nofp"
-  origin_address = "0x88000000"
+  origin_address = "0x80000000"
   use_pl011 = true
   pl011_base_address = "0x1c090000"
   gic_version = 3