Implement the bare minimal sysinfo for ARM platforms by
reading the CPU models from /proc/cpuinfo
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

This patch is to enable virSysinfoRead test case for POWER,
and provide sysinfo data on POWER.
Signed-off-by: NLi Zhang <zhlcindy@linux.vnet.ibm.com>
Reviewed-by: NViktor Mihajlovski <mihajlov@linux.vnet.ibm.com>

Test cases for virSysinfoRead. Initially, there are tests for
x86 (DMI based) and s390 (/proc/... based).
In lack of PPC data, I have stubbed out the test for it, but it
can be added with a minimal effort.
Signed-off-by: NViktor Mihajlovski <mihajlov@linux.vnet.ibm.com>