python: Fix unproxing of VectorParams

Previously proxy vector parameters would resolve correctly only for
Parent.all. Any other proxy such as Parent.any, or exact ones such as
Parent.addr_range would resolve to a *vector* of the right value
resulting into a vector of a vector. For example if we set:

DirectoryController0.addr_range = [0x100000-0x1fffff, 0x200000-0x2fffff]
DirectoryMemory0.addr_range = Parent.addr_range

where DirectoryController0 is the parent SimObject of DirectoryMemory0
after unproxying the Parent.addr_range VectorParam we would get

DirectoryMemory0.addr_range = [[0x100000-0x1fffff, 0x200000-0x2fffff]]

This change unifies handling of all three proxies to the same correct
unproxy mechanism.

Change-Id: Ie5107f69f58eb700b3e1b92c55210e0d53e6788d
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/2901
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

src/python/m5/params.py

@@ -245,10 +245,12 @@ class VectorParamValue(list):
         return [ v.getValue() for v in self ]
 
     def unproxy(self, base):
-        if len(self) == 1 and isinstance(self[0], proxy.AllProxy):
+        if len(self) == 1 and isinstance(self[0], proxy.BaseProxy):
+            # The value is a proxy (e.g. Parent.any, Parent.all or
+            # Parent.x) therefore try resolve it
             return self[0].unproxy(base)
         else:
-             return [v.unproxy(base) for v in self]
+            return [v.unproxy(base) for v in self]
 
 class SimObjectVector(VectorParamValue):
     # support clone operation