PCI: hotplug: Remove TODO about unused .get_power(), .hardware_test()

Remove TODO note resolved by 8ff4574c ("PCI: cpcihp: Remove unused
.get_power() and .set_power()") and 5b036cad ("PCI: cpcihp: Remove
unused struct cpci_hp_controller_ops.hardware_test").

Signed-off-by: Guilherme Giacomo Simoes <trintaeoitogc@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250611022123.201839-1-trintaeoitogc@gmail.com