core: fix cpu info for AMD Opterom Processor G5

Fix for detecting AMD Opteron Processor G5 as AMD Opteron Processor G4

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1064880
Change-Id: Ica30c91f572229e9cbd0277dd84852c8f99bd50e
Signed-off-by: Arik Hadas <ahadas@redhat.com>