Revert "travis-ci: Add qemu-x86_64 target"

This reverts commit 998ae28799c79c6bc796aea182ae6acf13d18284.

This continues to fail in travis itself, so remove for now.

Signed-off-by: Tom Rini <trini@konsulko.com>

.travis.yml

@@ -379,13 +379,6 @@ matrix:
           BUILDMAN="^qemu-x86$"
           TOOLCHAIN="x86_64"
           BUILD_ROM="yes"
-    - env:
-        - TEST_PY_BD="qemu-x86_64"
-          TEST_PY_TEST_SPEC="not sleep"
-          QEMU_TARGET="x86_64-softmmu"
-          BUILDMAN="^qemu-x86_64$"
-          TOOLCHAIN="x86_64"
-          BUILD_ROM="yes"
     - env:
         - TEST_PY_BD="zynq_zc702"
           TEST_PY_TEST_SPEC="not sleep"