s390/lcs: add missing MODULE_DESCRIPTION() macro

With ARCH=s390, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/s390/net/lcs.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Acked-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://patch.msgid.link/20240625-md-s390-drivers-s390-net-v2-1-5a8a2b2f2ae3@quicinc.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>