pldm: Don't depend on phosphor-logging

PLDM has no such dependency, and it will cause a circular dependency
when the openpower-pels phosphor-logging extension is enabled.

Add a dependency on sdeventplus.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: If96572edec207a7dc141405a239ffd21f596866a
diff --git a/recipes-phosphor/pldm/pldm_git.bb b/recipes-phosphor/pldm/pldm_git.bb
index c09e5dd..f9013a9 100644
--- a/recipes-phosphor/pldm/pldm_git.bb
+++ b/recipes-phosphor/pldm/pldm_git.bb
@@ -8,7 +8,7 @@
 require pldm.inc
 
 DEPENDS += "systemd"
-DEPENDS += "phosphor-logging"
+DEPENDS += "sdeventplus"
 DEPENDS += "phosphor-dbus-interfaces"
 DEPENDS += "nlohmann-json"
 DEPENDS += "boost"