[iwm] Remove dead code from iwm_pcie_load_cpu_sections().

• If device family is 8000 then iwm_pcie_load_cpu_sections() won't be called at all (iwm_pcie_load_cpu_sections_8000() is called in that case) so this piece of code never gets called.

Obtained from: dragonflybsd.git 3e9aaef308100a4d630feffc131e3aca2ae12f8a