staging: dgnc: dgnc_kcompat.h: remove unused macros

This patch removes the macros PARM_STR and PARM_ULONG given that they
are not used anywhere in the driver files.

Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>