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pinctrl: oxnas support removal

With [1] removing MPCore SMP support, this makes the OX820 barely usable,
associated with a clear lack of maintainance, development and migration to
dt-schema it's clear that Linux support for OX810 and OX820 should be removed.

In addition, the OX810 hasn't been booted for years and isn't even present
in an ARM config file.

For the OX820, lack of USB and SATA support makes the platform not usable
in the current Linux support and relies on off-tree drivers hacked from the
vendor (defunct for years) sources.

The last users are in the OpenWRT distribution, and today's removal means
support will still be in stable 6.1 LTS kernel until end of 2026.

If someone wants to take over the development even with lack of SMP, I'll
be happy to hand off maintainance.

It has been a fun time adding support for this architecture, but it's time
to get over!

This patchset only removes pinctrl/gpio code, and is derived from:
https://lore.kernel.org/r/20230630-topic-oxnas-upstream-remove-v2-0-fb6ab3dea87c@linaro.org

To: Linus Walleij <linus.walleij@linaro.org>
To: Neil Armstrong <neil.armstrong@linaro.org>
To: Rob Herring <robh+dt@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
To: Conor Dooley <conor+dt@kernel.org>
To: Bartosz Golaszewski <brgl@bgdev.pl>
To: Andy Shevchenko <andy@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-gpio@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-oxnas@groups.io
Cc: devicetree@vger.kernel.org
---
Changes in v3:
- Removed applied patches
- Added Andy's tags
- Reduced for pinctrl, rebased on pinctrl devel branch
- Link to v2: https://lore.kernel.org/r/20230630-topic-oxnas-upstream-remove-v2-0-fb6ab3dea87c@linaro.org

Changes in v2:
- s/maintainance/maintenance/
- added acked/review tags
- dropped already applied patches
- drop RFC
- Link to v1: https://lore.kernel.org/r/20230331-topic-oxnas-upstream-remove-v1-0-5bd58fd1dd1f@linaro.org

---
Neil Armstrong (3):
      pinctrl: pinctrl-oxnas: remove obsolete pinctrl driver
      dt-bindings: pinctrl: oxnas,pinctrl: remove obsolete bindings
      dt-bindings: gpio: gpio_oxnas: remove obsolete bindings

 .../devicetree/bindings/gpio/gpio_oxnas.txt        |   47 -
 .../devicetree/bindings/pinctrl/oxnas,pinctrl.txt  |   56 -
 drivers/pinctrl/Kconfig                            |   11 -
 drivers/pinctrl/Makefile                           |    1 -
 drivers/pinctrl/pinctrl-oxnas.c                    | 1291 --------------------
 5 files changed, 1406 deletions(-)
---
base-commit: c9b2572f488c3ed3974a0ff6885bb059b1751c86
change-id: 20230331-topic-oxnas-upstream-remove-a62e9d96feee

Best regards,