Add new drmGetNodeTypeFromFd function

Add a helper function that returns the type of device node from an fd.

Signed-off-by: Frank Binns <frank.binns@imgtec.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/xf86drm.h b/xf86drm.h
index 77937eb..afd38a1 100644
--- a/xf86drm.h
+++ b/xf86drm.h
@@ -744,6 +744,7 @@
 extern int drmHandleEvent(int fd, drmEventContextPtr evctx);
 
 extern char *drmGetDeviceNameFromFd(int fd);
+extern int drmGetNodeTypeFromFd(int fd);
 
 extern int drmPrimeHandleToFD(int fd, uint32_t handle, uint32_t flags, int *prime_fd);
 extern int drmPrimeFDToHandle(int fd, int prime_fd, uint32_t *handle);