witherspoon-pfault-analysis: Add sdeventplus DEPEND

This is needed for an upcoming change that makes
witherspoon-pfault-analysis depend on sdeventplus.

Change-Id: Ibe004610ae8b6153b1c3a661b86890cfe478a9dd
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-witherspoon/recipes-phosphor/power/witherspoon-pfault-analysis.bb b/meta-witherspoon/recipes-phosphor/power/witherspoon-pfault-analysis.bb
index 1d148df..31cc954 100644
--- a/meta-witherspoon/recipes-phosphor/power/witherspoon-pfault-analysis.bb
+++ b/meta-witherspoon/recipes-phosphor/power/witherspoon-pfault-analysis.bb
@@ -16,6 +16,7 @@
          autoconf-archive-native \
          openpower-dbus-interfaces \
          sdbus++-native \
+         sdeventplus \
          "
 
 RDEPENDS_${PN} += " \