tplink-safeloader: fix product_name of TP-Link AD7200

tplink-safeloader: fix product_name of TP-Link AD7200

The stock firmware does not accept firmware with "Talon" in the name.

Tested on firmware version 1.0.10 Build 20160902 rel. 57400 which came
preinstalled, as well as latest firmware version 2.0.1 Build 20170103
rel.71053 flashed from
AD7200v1-up-ver2-0-1-P1[20170103-rel71053]_2017-01-04_10.08.28.bin.

Fixes: 1a775a4fd033 ("ipq806x: add support for TP-Link Talon AD7200")
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
[added details about vendor firmware]
Signed-off-by: Petr Štetiar <ynezz@true.cz>