configs: ti_armv7_keystone2: replace addr_uboot with loadaddr

This patch replaces not existing addr_uboot environment variable by
loadaddr at get_uboot_net and burn_uboot_xxx commands. Otherwise these
commands are broken.
Signed-off-by: NVitaly Andrianov <vitalya@ti.com>
Acked-by: NNishanth Menon <nm@ti.com>

include/configs/ti_armv7_keystone2.h

@@ -234,11 +234,11 @@
 	"get_kern_ubi=ubifsload ${loadaddr} ${name_kern}\0"		\
 	"get_mon_net=dhcp ${addr_mon} ${tftp_root}/${name_mon}\0"	\
 	"get_mon_ubi=ubifsload ${addr_mon} ${name_mon}\0"		\
-	"get_uboot_net=dhcp ${addr_uboot} ${tftp_root}/${name_uboot}\0"	\
+	"get_uboot_net=dhcp ${loadaddr} ${tftp_root}/${name_uboot}\0"	\
 	"burn_uboot_spi=sf probe; sf erase 0 0x100000; "		\
-		"sf write ${addr_uboot} 0 ${filesize}\0"		\
+		"sf write ${loadaddr} 0 ${filesize}\0"		\
 	"burn_uboot_nand=nand erase 0 0x100000; "			\
-		"nand write ${addr_uboot} 0 ${filesize}\0"		\
+		"nand write ${loadaddr} 0 ${filesize}\0"		\
 	"args_all=setenv bootargs console=ttyS0,115200n8 rootwait=1\0"	\
 	"args_net=setenv bootargs ${bootargs} rootfstype=nfs "		\
 		"root=/dev/nfs rw nfsroot=${serverip}:${nfs_root},"	\