PCI/pwrctrl: Rename pwrctrl Kconfig symbols and slot module

PCI/pwrctrl: Rename pwrctrl Kconfig symbols and slot module

Commits b88cbaaa6fa1 ("PCI/pwrctrl: Rename pwrctl files to pwrctrl") and
3f925cd62874 ("PCI/pwrctrl: Rename pwrctrl functions and structures")
renamed the "pwrctl" framework to "pwrctrl" for consistency reasons.

Rename also the Kconfig symbols so that they reflect the new name while
adding entries for the deprecated ones. The old symbols can be removed once
everything that depends on them has been updated.

Note that no deprecated symbol is added for the new slot driver to avoid
having to add a user visible option.

Rename the new slot module to reflect the framework name and match the
other pwrctrl modules.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://patch.msgid.link/20250402132634.18065-2-johan+linaro@kernel.org