stats: Update the solaris boot stats for the default snoop_filter.

stats: Update the solaris boot stats for the default snoop_filter.

The snoop_filter was enabled by default by this change:

    commit 080d4e08d627b5b726afec71d38370373b7376c5
    Author: Andreas Hansson <andreas.hansson@arm.com>
    Date:   Fri Aug 12 14:11:45 2016 +0100

        mem: Add snoop filter to SystemXBar by default

Change-Id: I850473c70437588b47812f1dc00d6ecdb66daa36
Reviewed-on: https://gem5-review.googlesource.com/2647
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>