Revert "rainier and tacoma: Build u-boot spl"

This reverts commit f2f334e6221b659934a8e72f5ca1aa8c9b8ae173.

The u-boot openbmc spl defconfig is still in review:
https://patchwork.ozlabs.org/project/openbmc/patch/1586370073-71433-1-git-send-email-anoo@linux.ibm.com/

(From meta-ibm rev: 5bea35bdaa05c736796bd1d0f22f0c7eaee9b484)

Change-Id: I134d9044595c1e129d8b545ac4e4429a8a4d9f2b
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-ibm/meta-witherspoon/conf/machine/rainier.conf b/meta-ibm/meta-witherspoon/conf/machine/rainier.conf
index 4ce298e..1f8c21e 100644
--- a/meta-ibm/meta-witherspoon/conf/machine/rainier.conf
+++ b/meta-ibm/meta-witherspoon/conf/machine/rainier.conf
@@ -1,7 +1,6 @@
 KERNEL_DEVICETREE = "aspeed-bmc-ibm-rainier.dtb"
-UBOOT_MACHINE = "ast2600_openbmc_spl_defconfig"
+UBOOT_MACHINE = "ast2600_openbmc_defconfig"
 UBOOT_DEVICETREE = "ast2600-rainier"
-SPL_BINARY = "spl/u-boot-spl.bin"
 
 OBMC_POWER_SUPPLY_INSTANCES = "0 1 2 3"
 
diff --git a/meta-ibm/meta-witherspoon/conf/machine/witherspoon-tacoma.conf b/meta-ibm/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
index c367e4c..4d94d9e 100644
--- a/meta-ibm/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
+++ b/meta-ibm/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
@@ -1,7 +1,6 @@
 KERNEL_DEVICETREE = "aspeed-bmc-opp-tacoma.dtb"
-UBOOT_MACHINE = "ast2600_openbmc_spl_defconfig"
+UBOOT_MACHINE = "ast2600_openbmc_defconfig"
 UBOOT_DEVICETREE = "ast2600-tacoma"
-SPL_BINARY = "spl/u-boot-spl.bin"
 
 IMAGE_FSTYPES += "ext4 mmc-ext4-tar"