arm64: dts: allwinner: a523: Add MCU PRCM CCU node

arm64: dts: allwinner: a523: Add MCU PRCM CCU node

Add a device node for the third supported clock controller found in the
A523 / T527 SoCs. This controller has clocks and resets for the RISC-V
MCU, and others peripherals possibly meant to operate in low power mode
driven by the MCU, such as audio interfaces, an audio DSP, and the NPU.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20250911174710.3149589-7-wens@kernel.org
Signed-off-by: Chen-Yu Tsai <wens@csie.org>