Set coverage to false for dex2oat.

dex2oat explicitly sets address to false when SANITIZE_TARGET is
non-empty, in order to prevent it being compiled with ASAN. This CL also
sets coverage to false to prevent build errors when
SANITIZE_TARGET="address coverage" (because coverage currently does not
work without address).

Bug: 29188876
Test: SANITIZE_TARGET="address coverage" builds without error
Change-Id: I0faeb7fab76678b923af732235188e19e08ea90c
diff --git a/dex2oat/Android.bp b/dex2oat/Android.bp
index 931bbd3..05a5d0f 100644
--- a/dex2oat/Android.bp
+++ b/dex2oat/Android.bp
@@ -31,6 +31,7 @@
                 // SANITIZE_TARGET mode.
                 // Bug: 22233158
                 address: false,
+                coverage: false,
             },
         },
     },