travis: Add qemu-x86_64 target for test.py testing

Add qemu-x86_64 to the list of targets we use for test.py runs.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

.travis.yml

@@ -424,6 +424,14 @@ matrix:
           BUILDMAN="^qemu-x86$"
           TOOLCHAIN="i386"
           BUILD_ROM="yes"
+    - name: "test/py qemu-x86_64"
+      env:
+        - TEST_PY_BD="qemu-x86_64"
+          TEST_PY_TEST_SPEC="not sleep"
+          QEMU_TARGET="x86_64-softmmu"
+          BUILDMAN="^qemu-x86_64$"
+          TOOLCHAIN="i386"
+          BUILD_ROM="yes"
     - name: "test/py zynq_zc702"
       env:
         - TEST_PY_BD="zynq_zc702"