realtek: fix model for TP-Link TL-ST1008F v2.0

realtek: fix model for TP-Link TL-ST1008F v2.0

Fix the model name in DTS compatible, Makefiles and board scripts by
using dash instead of comma or underscore. This aligns it with other
examples in OpenWrt and makes in consistent in all places where the
board model is used.

'tplink,tl-st1008f,v2' --> 'tplink,tl-st1008f-v2'
'tplink,tl-st1008f_v2' --> 'tplink,tl-st1008f-v2'

Fixes: 39b9b491bb ("realtek: add support for TP-Link TL-ST1008F v2.0")
Fixes: #19930
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/19934
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>