The H6 SoC contains an undocumented but fully functional RSB controller.
Add support for it. The MMIO register address matches other SoCs of the
same generation, and the IRQ matches a hole in the documented IRQ list.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
[wens@csie.org: Use raw numbers instead of macros for clock/reset index]
Signed-off-by: Chen-Yu Tsai <wens@csie.org>