staging: emxx_udc: Remove misplaced debugging aid

emxx_udc.h contained a #if 0 block with debugging macros. These should
be supplied via command line or Kconfig.

Fixes checkstyle's
WARNING: Consider removing the code enclosed by this #if 0 and its #endif

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Link: https://lore.kernel.org/r/20200911213350.15914-1-dottedmag@dottedmag.net


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