ps3_gelic_net: Use __force u32 to avoid type warnning

The values of the gelic hardware descriptors are all be32.  Force cpu_addr to
u32 so the conversion to be32 won't give a warning.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312142250.7GMllD1E-lkp@intel.com/

Signed-off-by: Geoff Levand <geoff@infradead.org>