gpio: updates for v5.14

- new driver for the IDT 79RC3243x GPIO controller
- device tree bindings coversion to YAML for the following drivers:
  gpio-rk3328-grf, gpio-omap, gpio-davinci, gpio-zynq, gpio-stp, gpio-pcf857x
- cleanup of probe functions in many drivers from Alexandru Ardelean, mostly
  dropping unnecessary calls to platform_set_drvdata() and removing error
  messages where none are needed (handled by the subsystem already)
- several improvements to the core gpiolib and the sysfs interface code from
  Andy Shevchenko
- conversion of the gpio-xilinx driver to using the bitmap API + improvements
  of suspend/resume handling + minor tweaks
- convert the gpio-stmpe to using devres helpers exclusively in probe for
  improved robustness
- updates for the generic gpio-regmap driver
- updates for the gpio-dwapb driver
- support for a new model in gpio-pca953x
- cleanups in gpio-tegra186, gpio-104-idio-16, gpio-mxs & gpio-xgene
- slight code refactoring of the gpio-zynq driver
- documentation fixes from Mauro Carvalho Chehab
- a bunch of minor tweaks and improvements all over the place
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