tacoma: Build a mmc-ext4-tar image

The mmc-ext4-tar image is used for MMC code updates.

(From meta-ibm rev: 4471bfb1798201d4b7f03912600474825034db0c)

Change-Id: I9c26f9eebfccccce80eb405d8ddf9f7b59c34fd8
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/witherspoon-tacoma.conf b/meta-ibm/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
index 765c068..4d94d9e 100644
--- a/meta-ibm/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
+++ b/meta-ibm/meta-witherspoon/conf/machine/witherspoon-tacoma.conf
@@ -2,7 +2,7 @@
 UBOOT_MACHINE = "ast2600_openbmc_defconfig"
 UBOOT_DEVICETREE = "ast2600-tacoma"
 
-IMAGE_FSTYPES += "ext4"
+IMAGE_FSTYPES += "ext4 mmc-ext4-tar"
 
 OBMC_POWER_SUPPLY_INSTANCES = "0 1"