meta-intel-openbmc: phosphor-sel-logger: Use packageconfig

This makes it possible for us to change out build specific settings.

Change-Id: I5381937cf0593411f517c86d9160b2ee2a9dc067
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-intel-openbmc/meta-common/recipes-phosphor/sel-logger/phosphor-sel-logger_%.bbappend b/meta-intel-openbmc/meta-common/recipes-phosphor/sel-logger/phosphor-sel-logger_%.bbappend
index 3e769e1..c7e2194 100644
--- a/meta-intel-openbmc/meta-common/recipes-phosphor/sel-logger/phosphor-sel-logger_%.bbappend
+++ b/meta-intel-openbmc/meta-common/recipes-phosphor/sel-logger/phosphor-sel-logger_%.bbappend
@@ -1,2 +1 @@
-# Enable threshold monitoring
-EXTRA_OECMAKE_intel += "-DSEL_LOGGER_MONITOR_THRESHOLD_EVENTS=ON"
+PACKAGECONFIG_append_intel = " log-threshold"