Restore "lib: Open debugfs files for the given DRM device"

This reverts commit 25fbae15262cf570e207e62f50e7c5233e06bc67, restoring
commit 301ad44cdf1b868b1ab89096721da91fa8541fdc
Author: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Date:   Thu Mar 2 10:37:11 2017 +0100

    lib: Open debugfs files for the given DRM device

with fixes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/tests/gem_eio.c b/tests/gem_eio.c
index d9e6865..3c82662 100644
--- a/tests/gem_eio.c
+++ b/tests/gem_eio.c
@@ -61,7 +61,7 @@
 
 static void trigger_reset(int fd)
 {
-	igt_force_gpu_reset();
+	igt_force_gpu_reset(fd);
 
 	/* And just check the gpu is indeed running again */
 	igt_debug("Checking that the GPU recovered\n");