reset: spacemit: Add SpacemiT K3 reset driver

reset: spacemit: Add SpacemiT K3 reset driver

Add support for the SpacemiT K3 SoC reset controller. The K3 reset
driver reuses the common reset controller code and provides K3-specific
reset data for devices managed by the following units:

 - MPMU (Main Power Management Unit)
 - APBC (APB clock unit)
 - APMU (Application Subsystem Power Management Unit)
 - DCIU (DMA Control and Interface Unit)

Acked-by: Alex Elder <elder@riscstar.com>
Signed-off-by: Guodong Xu <guodong@riscstar.com>
Reviewed-by: Yixun Lan <dlan@kernel.org>
Link: https://lore.kernel.org/spacemit/20260114092742-GYC7933267@gentoo.org/
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>