staging: r8188eu: remove include/rtw_debug.h

staging: r8188eu: remove include/rtw_debug.h

Remove include/rtw_debug.h, as all it now has are:

(1) A load of unused preprocessor definitions that expand to BIT(x)
    variants.
(2) A preprocessor definition that expands to the name of the driver
    and is only used in one place inside a pr_info_once call in
    core/rtw_fw.c.

It is now surplus to requirements after fixing up the few places that
include the file.

Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20220519221047.6940-1-phil@philpotter.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>