bus: sunxi-rsb: Split out controller init/exit functions

This separates the resource acquisition from the hardware initialization
phase, so the hardware initialization can be repeated after system
suspend/resume. The same is done for the exit/remove function, except
that there is no resource deallocation phase due to the use of devres.

The requested RSB clock frequency is stored in `struct sunxi_rsb` so it
will be available when reinitializing the hardware.

Signed-off-by: Samuel Holland <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Signed-off-by: Chen-Yu Tsai <[email protected]>

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