skpbench: filter out junk spewed by Pixel C driver

tools/skpbench/_hardware.py

Index: tools/skpbench/_hardware.py
diff --git a/tools/skpbench/_hardware.py b/tools/skpbench/_hardware.py
index 525c4c1e491cce7d8bfaa2fd127b5a0968bc3638..de8848df783092e89f87ea5e198900aebdbe7bee 100644
--- a/tools/skpbench/_hardware.py
+++ b/tools/skpbench/_hardware.py
@@ -29,6 +29,10 @@ class Hardware:
   def __exit__(self, exception_type, exception_value, traceback):
     pass
 
+  def filter_line(self, line):
+    """Returns False if the provided output line can be suppressed."""
+    return True
+
   def sanity_check(self):
     """Raises a HardwareException if any hardware state is not as expected."""
     pass