Don't update U-Boot env variables using code update service

The U-Boot env variables are updated using the BMC itemUpdater
once the code update completes succesfully.

Partially resolves openbmc/openbmc#2535

Change-Id: Ic3a937c053748ae77a22d0e11b5ea786582a3937
Signed-off-by: Saqib Khan <khansa@us.ibm.com>
diff --git a/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc-ubiro@.service b/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc-ubiro@.service
index c1fc709..5cd8565 100644
--- a/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc-ubiro@.service
+++ b/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc-ubiro@.service
@@ -9,5 +9,4 @@
 ExecStart=/usr/bin/env obmc-flash-bmc ubiro {RO_MTD} rofs-%i %i
 ExecStart=/usr/bin/env obmc-flash-bmc ubikernel {KERNEL_MTD} kernel-%i %i
 ExecStart=/usr/bin/env obmc-flash-bmc mtduboot u-boot %i
-ExecStartPost=/usr/bin/env obmc-flash-bmc updateubootvars %i
 SyslogIdentifier=obmc-flash-bmc