Move default providers to distro config

Move the fake, example implementations from sample.inc
to phosphor-defaults.  Other layers override as needed.

Change-Id: Ic024b13c39bf1750f5c76bc0fac1d18092e8305d
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/conf/machine/include/openpower.inc b/conf/machine/include/openpower.inc
index c7d6fc9..4e79587 100644
--- a/conf/machine/include/openpower.inc
+++ b/conf/machine/include/openpower.inc
@@ -11,9 +11,7 @@
 
 PREFERRED_PROVIDER_virtual/obmc-host-ipmi-hw = "btbridged"
 PREFERRED_PROVIDER_virtual/obmc-chassis-mgmt = "skeleton"
-PREFERRED_PROVIDER_virtual/obmc-event-mgmt = "obmc-phosphor-event"
 PREFERRED_PROVIDER_virtual/obmc-fan-mgmt = "skeleton"
 PREFERRED_PROVIDER_virtual/obmc-flash-mgmt = "skeleton"
 PREFERRED_PROVIDER_virtual/obmc-sensor-mgmt = "skeleton"
 PREFERRED_PROVIDER_virtual/obmc-system-mgmt = "skeleton"
-PREFERRED_PROVIDER_virtual/obmc-user-mgmt = "obmc-phosphor-user"