phosphor-watchdog: Enable sdeventplus support

An upcoming commit to phosphor-watchdog will require sdeventplus during
the build process.

Tested:
    Build still works as expected. Manually patching in the sdeventplus
    patch works as expected.

(From meta-phosphor rev: 6e1dfdd6958f069c20606490ce65ecc5f99da62f)

Change-Id: Ib450d12a7f74862ded1288aeea4d2046108281ba
Signed-off-by: William A. Kennington III <wak@google.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-phosphor/watchdog/phosphor-watchdog.bb b/meta-phosphor/recipes-phosphor/watchdog/phosphor-watchdog.bb
index 55a7447..0ab2be9 100644
--- a/meta-phosphor/recipes-phosphor/watchdog/phosphor-watchdog.bb
+++ b/meta-phosphor/recipes-phosphor/watchdog/phosphor-watchdog.bb
@@ -13,6 +13,7 @@
 
 DEPENDS += "autoconf-archive-native"
 DEPENDS += "sdbusplus sdbusplus-native"
+DEPENDS += "sdeventplus"
 DEPENDS += "phosphor-dbus-interfaces"
 DEPENDS += "phosphor-logging"
 RDEPENDS_${PN} += "libsystemd"