drm_hwcomposer: Remove drmSetMaster call

Now that gralloc is using a render node, we can remove
this call. This allows us to run as a non-root user as
well.

Change-Id: I46c9c16c7a9a169378e567d4973172f8392d441b
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/hwcomposer.cpp b/hwcomposer.cpp
index 912bb74..2fe2244 100644
--- a/hwcomposer.cpp
+++ b/hwcomposer.cpp
@@ -1294,12 +1294,6 @@
 		goto out;
 	}
 
-	ret = drmSetMaster(ctx->fd);
-	if (ret) {
-		ALOGE("Failed to set hwcomposer as drm master %d", ret);
-		goto out;
-	}
-
 	ret = hwc_enumerate_displays(ctx);
 	if (ret) {
 		ALOGE("Failed to enumerate displays: %s", strerror(ret));