nitrogen53k: fix button gpio numbers
Added hdmi bootscript
Adding support for booting into recovery
Added uboot script with support for booting into recovery partition
Added new uboot script
Added new uboot scripts
Update nitrogen53_bootscript_hdmi.txt

Added boot arguments that put the serial number from u-boot into kernel command line.
Update nitrogen53_bootscript_hdmi_recovery_partition.txt

Added boot arguments that copy the serial number in u-boot to the kernel command line.
Update nitrogen53_bootscript_hdmi_recovery_partition_emmc.txt

Added boot arguments to copy the serial number from u-boot into the kernel command line.
Update nitrogen53_bootscript_hdmi_recovery_partition_update_uboot.txt

Added boot arguments so that the serial number is copied from the u-boot environment, into the kernel command line.
Added boot arguments so that the serial number can be forwarded from u-boot,
to the kernel command line.