staging: rtl8188eu: remove DRIVER_PREFIX preprocessor definition

Remove DRIVER_PREFIX preprocessor definition, as well as the short
block of dumping code that uses it in core/rtw_recv.c - this code
is unneeded, as normal debugging facilities can tell us what driver
this is simply by pathname etc.

Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210625000756.6313-22-phil@philpotter.co.uk


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>