lg2: commit: add stubs to support new sdbusplus events

Create empty stubs for the commit functions from the new event
log design[1].

[1]: https://github.com/openbmc/docs/blob/master/designs/event-logging.md

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I8c0232858f41b875e78d5e41f17c065ca727429d
diff --git a/lib/meson.build b/lib/meson.build
index 1e2f51f..3c7e3fc 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -16,6 +16,7 @@
 phosphor_logging_lib = library(
     'phosphor_logging',
     'elog.cpp',
+    'lg2_commit.cpp',
     'lg2_logger.cpp',
     'sdjournal.cpp',
     phosphor_logging_gen,