i40e: Add missing wordpart.h header

i40e: Add missing wordpart.h header

When cleaning up another header I have met this build error:

drivers/net/ethernet/intel/i40e/i40e_hmc.h:105:22: error: implicit declaration of function 'upper_32_bits' [-Wimplicit-function-declaration]
  105 |         val1 = (u32)(upper_32_bits(pa));                                \

This is due to missing header, add it to fix the possible issue.

Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>