platform/gem5: always deploy m5 binary

m5 binaries are not properly versioned, so it is not possible to be sure
that the one that is already present on the image has all the features
needed by devlib. Thus always deploy and use our version.

Author: setrofim

devlib/platform/gem5.py

@@ -200,9 +200,7 @@ def setup(self, target):
         """
         Deploy m5 if not yet installed
         """
-        m5_path = target.get_installed('m5')
-        if m5_path is None:
-            m5_path = self._deploy_m5(target)
+        m5_path = self._deploy_m5(target)
         target.conn.m5_path = m5_path
 
         # Set the terminal settings for the connection to gem5