meta-facebook: minerva: modify kernel device tree

Modify KERNEL_DEVICETREE from ast2600-evb to minerva dtb.

Change-Id: I591d36af0b12c212ba8ba7758bb481d1f77c547b
Signed-off-by: Yang Chen <yang.chen@quantatw.com>
diff --git a/meta-facebook/meta-minerva/conf/machine/minerva.conf b/meta-facebook/meta-minerva/conf/machine/minerva.conf
index d73a729..22b6a3d 100644
--- a/meta-facebook/meta-minerva/conf/machine/minerva.conf
+++ b/meta-facebook/meta-minerva/conf/machine/minerva.conf
@@ -1,6 +1,5 @@
 KMACHINE = "aspeed"
-#KERNEL_DEVICETREE = "aspeed/${KMACHINE}-bmc-facebook-${MACHINE}.dtb"
-KERNEL_DEVICETREE = "aspeed/aspeed-ast2600-evb.dtb"
+KERNEL_DEVICETREE = "aspeed/${KMACHINE}-bmc-facebook-${MACHINE}.dtb"
 
 UBOOT_MACHINE = "ast2600_openbmc_spl_defconfig"
 UBOOT_DEVICETREE = "ast2600-bletchley"