egl/android: Fix error condition for EGL_ANDROID_image_native_buffer

egl/android: Fix error condition for EGL_ANDROID_image_native_buffer

Emit EGL_BAD_CONTEXT if the user passes a context to
eglCreateImageKHR(type=EGL_ANDROID_image_native_buffer).

From the EGL_ANDROID_image_native_buffer spec:
  * If <target> is EGL_NATIVE_BUFFER_ANDROID and <ctx> is not
    EGL_NO_CONTEXT, the error EGL_BAD_CONTEXT is generated.

Note: This is a candidate for the stable branches.
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>
Change-Id: I01c4f09aaa13fc01a75b5a721b85df6a99e2072a