witherspoon-tacoma.conf: Build an ext4 image

Build an ext4 rootfs image for tacoma to be used in its eMMC chip.

Change-Id: I60275d0c586830da372c36559cc9b9842e4a3d39
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/meta-witherspoon/conf/machine/witherspoon-tacoma.conf b/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
index 2184847..a57d142 100644
--- a/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
+++ b/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
@@ -1,6 +1,8 @@
 KERNEL_DEVICETREE = "aspeed-bmc-opp-tacoma.dtb"
 UBOOT_MACHINE = "evb-ast2600_defconfig"
 
+IMAGE_FSTYPES += "ext4"
+
 OBMC_POWER_SUPPLY_INSTANCES = "0 1"
 
 MACHINEOVERRIDES =. "ibm-ac-server:witherspoon:"