drivers/svga, winsys/svga/drm: Thread through timeout for fence_finish

The timeout parameter is required to implement
EGL_ANDROID_native_fence_sync.

v2
* Replaced default timeout from 0 to PIPE_TIMEOUT_INFINITE
* Add more documentation to the new timeout parameter

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>
7 files changed