Change variable name

src/freedombone-image-hardware-setup

@@ -164,13 +164,13 @@ arm_setup_boot() {
     arm_boot_dev=
     arm_boot_console='ttyO0,115200n8'
     arm_arch=arm
-    arm_pack_kernel=
+    arm_uenv=
 
     case "$dtb" in
         "am"*) arm_loadaddr='0x82000000'
                arm_initrd_addr='0x88080000'
                arm_fdtaddr='0x88000000'
-               arm_pack_kernel=1
+               arm_uenv=1
                if [ "$EXTERNAL_DRIVE" ]; then
                    arm_boot_dev='bootdev=0:1'
                    arm_boot_device="usb \${bootdev}"
@@ -195,7 +195,7 @@ arm_setup_boot() {
                          ;;
     esac
 
-    if [ $arm_pack_kernel ]; then
+    if [ $arm_uenv ]; then
         cat >> /boot/uEnv.txt <<EOF
 mmcroot=/dev/${arm_root_device} ro
 mmcrootfstype=$fstype rootwait fixrtc