cpuinfoapp: Make PECI features optional

Add a feature flag `cpuinfo-peci` to optionally disable the features in
cpuinfoapp that rely on PECI (PPIN, SST), to support configurations that
want I2C-based SSPEC detection but don't want to use libpeci.

Tested: Disabled `cpuinfo-peci` and verified SSPEC was still written
into the Model property.

Change-Id: Ie3ab9214d9d6ab238a61933de3e3856eca298fa8
Signed-off-by: Jonathan Doman <jonathan.doman@intel.com>
diff --git a/meson.options b/meson.options
index 1a4cdf8..1c33165 100644
--- a/meson.options
+++ b/meson.options
@@ -34,6 +34,13 @@
 )
 
 option(
+  'cpuinfo-peci',
+  type: 'feature',
+  value: 'enabled',
+  description: 'Enable CPUInfo features that depend on PECI'
+)
+
+option(
   'smbios-ipmi-blob',
   type: 'feature',
   value: 'enabled',