Use out of (kernel) tree device tree (Palmetto)
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-palmetto/conf/machine/palmetto.conf b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-palmetto/conf/machine/palmetto.conf
index f6256a7..d57bdcb 100644
--- a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-palmetto/conf/machine/palmetto.conf
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-palmetto/conf/machine/palmetto.conf
@@ -1,5 +1,5 @@
 KMACHINE = "aspeed"
-KERNEL_DEVICETREE = "${KMACHINE}-bmc-opp-${MACHINE}.dtb"
+KERNEL_DEVICETREE = "${MACHINE}.dtb"
 
 require conf/machine/include/ast2400.inc
 require conf/machine/include/obmc-bsp-common.inc