sun50i: A64: add support for R_I2C controller
Allwinner A64 has a I2C controller, which is in the R_ MMIO zone and has two groups of pinmuxes on PL bank, so it's called R_I2C. Add support for this I2C controller and the pinmux which doesn't conflict with RSB. Signed-off-by: NVasily Khoruzhick <anarsoul@gmail.com> Acked-by: NMaxime Ripard <maxime.ripard@bootlin.com> Tested-by: NMaxime Ripard <maxime.ripard@bootlin.com> Cc: Vagrant Cascadian <vagrant@debian.org> Acked-by: NJagan Teki <jagan@openedev.com>
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