fault-monitor: remove locally generated errors

Switch fault-monitor to use Common.Errors instead of locally defined
ones.  This greatly simplifies the build structure and follows the
expected phosphor-logging patterns better.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Idb3473989c86b3a505f3c0a238735db6f3a4349e
diff --git a/fault-monitor/meson.build b/fault-monitor/meson.build
index 254a218..39ec458 100644
--- a/fault-monitor/meson.build
+++ b/fault-monitor/meson.build
@@ -1,5 +1,4 @@
 fault_monitor_sources = [
-    generated_sources,
     'monitor-main.cpp',
 ]
 
@@ -17,7 +16,7 @@
 executable(
     'phosphor-fru-fault-monitor',
     fault_monitor_sources,
-    include_directories: ['.', '../', '../gen'],
+    include_directories: ['.', '../'],
     dependencies: deps,
     install: true,
     install_dir: get_option('bindir')