Gpio driver#353
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Add gpio peripheral driver to ast10x0_peripherals crate, ported from aspeed-rust/src/gpio.rs. Follows the crate's established driver pattern: - types.rs: type states (Input, Output, PushPull, OpenDrain, PullUp, PullDown, Floating, Tristate), mode traits, InterruptMode, GpioExt, GpioError - registers.rs: GpioRegisters wrapping *const gpio::RegisterBlock with PhantomData<*const ()>, unsafe new(ptr) and new_global() constructors - mod.rs: gpio_macro! adapted to use GpioRegisters; all 21 bank instantiations A-U Update lib.rs and BUILD.bazel accordingly.
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Add gpio driver and tests.