s4:rpc_server: Fix duplicated function name between s3 and s4
It can lead to link errors:
/usr/lib64/gcc/x86_64-suse-linux/11/../../../../x86_64-suse-linux/bin/ld: source3/rpc_server/rpc_server.c.24.o: in function `dcesrv_assoc_group_find':
/home/scabrero/workspace/samba/samba/bin/default/../../source3/rpc_server/rpc_server.c:229: multiple definition of `dcesrv_assoc_group_find'; source4/rpc_server/dcerpc_server.c.5.o:/home/scabrero/workspace/samba/samba/bin/default/../../source4/rpc_server/dcerpc_server.c:121: first defined here
Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>