Remove fdump tool for av7110 firmware

There's no point in this, since the user can use the BUILTIN_FIRMWARE
option to include arbitrary firmware files directly in the kernel image.

Thanks to David Woodhouse for help.

Signed-off-by: Jaswinder Singh <jaswinder@infradead.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>