arm: make the PseudoLRU tags the default for the O3_ARM_v7aL2
arm: make the PseudoLRU tags the default for the O3_ARM_v7aL2

the Cortex-A15 has a random replacement policy for its L2 cache. see the
Cortex-A15 Technical Reference Manual 1.7 About the L2 memory system. this
patch makes the PseudoLRU tags the default for the ARM O3 CPU's L2 cache.

vovojh/gem5,pombredanne/http-repo.gem5.org-gem5-,hoangt/tpzsimul.gem5,hoangt/tpzsimul.gem5,pombredanne/http-repo.gem5.org-gem5-,vovojh/gem5,pombredanne/http-repo.gem5.org-gem5-,vovojh/gem5,vovojh/gem5,hoangt/tpzsimul.gem5,pombredanne/http-repo.gem5.org-gem5-,hoangt/tpzsimul.gem5,pombredanne/http-repo.gem5.org-gem5-,hoangt/tpzsimul.gem5,hoangt/tpzsimul.gem5,vovojh/gem5,vovojh/gem5,pombredanne/http-repo.gem5.org-gem5-,vovojh/gem5,hoangt/tpzsimul.gem5,pombredanne/http-repo.gem5.org-gem5-