[Tizen] Remove crosswalk-2.31-enable-VAVDA-with-EGL.patch.

This patch was added but was never used by the spec file. Since nobody has
complained for almost 5 months, it should be safe to remove it.
Merge pull request #1745 from rakuco/remove-unused-tizen-patch

[Tizen] Remove crosswalk-2.31-enable-VAVDA-with-EGL.patch.