meta-ibm: Move Tacoma and Rainier to eMMC u-boot config

The AST2600 systems booted from NOR during bringup, but now that we have
eMMC support in u-boot they can run from eMMC.

(From meta-ibm rev: 46419c51c3bd3d43873ecbab7fbbb6f1d6c54de4)

Signed-off-by: Joel Stanley <joel@jms.id.au>
Change-Id: Idd2389ab62e1b7cc32639f5547f1f1098631654f
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-ibm/conf/machine/rainier.conf b/meta-ibm/conf/machine/rainier.conf
index 3fe43f3..9c1a7a4 100644
--- a/meta-ibm/conf/machine/rainier.conf
+++ b/meta-ibm/conf/machine/rainier.conf
@@ -1,5 +1,5 @@
 KERNEL_DEVICETREE = "aspeed-bmc-ibm-rainier.dtb"
-UBOOT_MACHINE = "ast2600_openbmc_spl_defconfig"
+UBOOT_MACHINE = "ast2600_openbmc_spl_emmc_defconfig"
 UBOOT_DEVICETREE = "ast2600-rainier"
 SPL_BINARY = "spl/u-boot-spl.bin"
 
diff --git a/meta-ibm/conf/machine/witherspoon-tacoma.conf b/meta-ibm/conf/machine/witherspoon-tacoma.conf
index 572484f..6948853 100644
--- a/meta-ibm/conf/machine/witherspoon-tacoma.conf
+++ b/meta-ibm/conf/machine/witherspoon-tacoma.conf
@@ -1,5 +1,5 @@
 KERNEL_DEVICETREE = "aspeed-bmc-opp-tacoma.dtb"
-UBOOT_MACHINE = "ast2600_openbmc_spl_defconfig"
+UBOOT_MACHINE = "ast2600_openbmc_spl_emmc_defconfig"
 UBOOT_DEVICETREE = "ast2600-tacoma"
 SPL_BINARY = "spl/u-boot-spl.bin"