tools: Drop unnecessary use of __file__

There are few places where the path of the current modules is calculated
but not used. Drop them.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/rmboard.py

@@ -28,9 +28,6 @@ import os
 import re
 import sys
 
-# Bring in the patman libraries
-our_path = os.path.dirname(os.path.realpath(__file__))
-
 from patman import command
 
 def rm_kconfig_include(path):