Use OEM parser on all OpenPOWER systems

This was only being picked up on Palmetto.
diff --git a/meta-palmetto/conf/machine/palmetto.conf b/meta-palmetto/conf/machine/palmetto.conf
index 7c137a4..f6256a7 100644
--- a/meta-palmetto/conf/machine/palmetto.conf
+++ b/meta-palmetto/conf/machine/palmetto.conf
@@ -1,9 +1,6 @@
 KMACHINE = "aspeed"
 KERNEL_DEVICETREE = "${KMACHINE}-bmc-opp-${MACHINE}.dtb"
 
-VIRTUAL-RUNTIME_obmc-phosphor-ipmi-parsers = " \
-        host-ipmid-oem \
-       "
 require conf/machine/include/ast2400.inc
 require conf/machine/include/obmc-bsp-common.inc
 require conf/machine/include/ibm.inc