travis: Add large-write to all overwrite-only tests

Add the large-write feature to all of the tests that test
overwrite-only.  This verifies that these large writes will work in all
of these configurations.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/.travis.yml b/.travis.yml
index 7eacbdc..fcfff16 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,11 +23,11 @@
     # separated by ',' and each list of values is run sequentially in the
     # defined order.
     - os: linux
-      env: MULTI_FEATURES="sig-rsa overwrite-only,sig-ecdsa overwrite-only,multiimage overwrite-only" TEST=sim
+      env: MULTI_FEATURES="sig-rsa overwrite-only large-write,sig-ecdsa overwrite-only large-write,multiimage overwrite-only large-write" TEST=sim
     - os: linux
       env: MULTI_FEATURES="sig-rsa validate-primary-slot,sig-ecdsa validate-primary-slot,sig-rsa multiimage validate-primary-slot" TEST=sim
     - os: linux
-      env: MULTI_FEATURES="enc-kw overwrite-only,enc-rsa overwrite-only" TEST=sim
+      env: MULTI_FEATURES="enc-kw overwrite-only large-write,enc-rsa overwrite-only large-write" TEST=sim
     - os: linux
       env: MULTI_FEATURES="sig-rsa enc-rsa validate-primary-slot" TEST=sim
     - os: linux
@@ -35,7 +35,7 @@
     - os: linux
       env: MULTI_FEATURES="sig-ecdsa enc-kw validate-primary-slot" TEST=sim
     - os: linux
-      env: MULTI_FEATURES="sig-rsa validate-primary-slot overwrite-only,sig-ecdsa enc-ec256 validate-primary-slot" TEST=sim
+      env: MULTI_FEATURES="sig-rsa validate-primary-slot overwrite-only large-write,sig-ecdsa enc-ec256 validate-primary-slot" TEST=sim
 
     - os: linux
       language: go