Ensure that busybox useage.h is ok in latest version

[ntadmin]

Path: busybox-1.13/include/usage.h

[ntadmin]

Diff:

16a17,24
>
> #define flash_eraseall_trivial_usage \
>       "Erase flash device"
> #define flash_eraseall_full_usage \
>       "Erase flash device\n\n"
> #define flash_eraseall_example_usage \
>       "$ flash_eraseall\n"
>
99a108,117
> // brcm begin
> #define sendarp_trivial_usage \
>        "-s <src device name> -d <dst device name>"
> #define sendarp_full_usage "\n\n" \
>        "Send ARP packet with src device's IP and Hardware address to dst device.\n" \
>      "\nOptions:" \
>      "\n      -s DEVNAME      src device name." \
>      "\n      -d DEVNAME      dst device name." \
>
> // brcm end

This adds help information to busybox for commands which seem to have been added it by netgear:

• sendarp. This is already in our codebase as a stand-alone binary to fill that gap in.
• flash_erase_all. Requires investigation before we can close this one down.

[ntadmin]

flash_eraseall is included in recent versions of busybox, definitely there in 1.23.2 with usage instaructions. Can close this as expected to work.