cmake: add a build option for cpuinfo

cpuinfo service is proprietary for Intel platforms. ARM based platforms
can transfer the SMBIOS tables though IPMI blob interface and employ
the SMBIOS service.

Tested:
Build smbios-mdrv2 service and smbios-ipmi-blobs library and work as
expected.

Change-Id: I29b924a310fd7dedcb0875b3328c39f8857300ee
Signed-off-by: Jie Yang <jjy@google.com>
1 file changed