uio_netx: Warning when compiling user newer GCC or Kernel

Newer kernels / gcc complains when compiling:

drivers/uio/uio_netx.c: In function 'get_dt_parameter':
drivers/uio/uio_netx.c:792:34: warning: division 'sizeof (long unsigned int *) / sizeof (long unsigned int)' does not compute the number of array elements [-Wsizeof-pointer-div]
  792 |  return (sizeof(custom->dpm_addr)/sizeof(unsigned long));
      |                                  ^

this feature is only used in conjunction with ARM/Device-Tree and this warning could safely be ignored.