ipq806x: EA8500 fix boot partition detection

Remove extraneous code that disabled boot partition detection.

Fixes: b3770eaca3 ("mtd: base-files: Unify dual-firmware devices (Linksys)")
Signed-off-by: Samantha Collard <sammyrc34@gmail.com>

target/linux/ipq806x/base-files/lib/upgrade/linksys.sh

@@ -21,8 +21,6 @@ linksys_get_target_firmware() {
 			"${cur_boot_part}" "${mtd_ubi0}"
 	fi
 
-	cur_boot_part=$(/usr/sbin/fw_printenv -n boot_part)
-
 	case $cur_boot_part in
 	1)
 		fw_setenv -s - <<-EOF