powerpc/eeh: fix incorrect function name in comment

The comment block above pcibios_set_pcie_reset_state() incorrectly refers
to pcibios_set_pcie_slot_reset(). Fix the comment accordingly.

Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>