configs: keystone2: env: Fix burn_uboot_spi command

Now the u-boot spi image is greater than 0x80000, increase the same
in env during spi erase.

Reported-by: Yan Liu <yan-liu@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

include/configs/ti_armv7_keystone2.h

@@ -270,7 +270,7 @@
 					"${bootdir}/${fit_bootfile}\0"	\
 	"get_uboot_net=dhcp ${loadaddr} ${tftp_root}/${name_uboot}\0"	\
 	"get_uboot_nfs=nfs ${loadaddr} ${nfs_root}/boot/${name_uboot}\0" \
-	"burn_uboot_spi=sf probe; sf erase 0 0x80000; "		\
+	"burn_uboot_spi=sf probe; sf erase 0 0x90000; "		\
 		"sf write ${loadaddr} 0 ${filesize}\0"		\
 	"burn_uboot_nand=nand erase 0 0x100000; "			\
 		"nand write ${loadaddr} 0 ${filesize}\0"		\