staging: r8188eu: remove _dbg_dump_tx_info function

staging: r8188eu: remove _dbg_dump_tx_info function

Remove _dbg_dump_tx_info from hal/rtl8188e_xmit.c as it is just a
dumping function that contains a lot of unclear DBG_88E calls, and has
no other external effect, other than calling a function that ultimately
determines whether or not to dump/trigger the DBG_88E calls. Also remove
its declaration and single call site.

Acked-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210818234253.208271-2-phil@philpotter.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>