Add option to enable/disable forced warm reboots

Some OpenBMC systems don't support a forced warm reboot. Provide a
compile option to enable/disable.

Tested:
- Confirmed that if feature is disabled, then AllowedHostTransitions did
  not have ForceWarmReboot option.

Change-Id: I207b8fa7e3f60efbf406397ff4df980a5d2677ed
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meson.options b/meson.options
index c2891bc..0c86bcb 100644
--- a/meson.options
+++ b/meson.options
@@ -101,6 +101,11 @@
     description : 'Enable warm reboots of the system',
 )
 
+option('force-warm-reboot', type : 'feature',
+    value : 'enabled',
+    description : 'Enable forced warm reboots of the system',
+)
+
 option('host-gpios', type : 'feature',
     value : 'disabled',
     description : 'Enable gpio mechanism to check host state.',