Add device driver for APU2/APU3 GPIOs

[Florian Eckert <fe@xxxxxxxxxx>]

Add a new gpio-apu device driver to use GPIOs found on APU2/APU3 devices.
This is the v2 of the patch:
Changes:
- Update SPDX short identifier
- Remove gpio-keys-polled device moved to arch/x86/platform
- Fix styling
- Use spinnlock only there where it is usefull
- Removed useless output on driver load
- Do bit manipulation later not on IO
- Add additional GPIOs handling mpci2_reset and mpcie3_reset.
- Add name to GPIOs exported via sysfs

Add a new platform device for the frontpanel push button to
arch/x86/platform/amd. This uses the gpio-apu driver.

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