clk: sunxi-ng: d1: Mark cpux clock as critical

Some SoCs in the D1 family feature ARM CPUs instead of a RISC-V CPU.
In that case, the CPUs are driven from the 'cpux' clock, so it needs
to be marked as critical, since there is no consumer when DVFS is
disabled. This matches the drivers for other SoCs, and the "riscv"
clock in this driver.

Signed-off-by: András Szemző <szemzo.andras@gmail.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20221231231429.18357-5-samuel@sholland.org


Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>