arm64: dts: rockchip: define cpu-supply on the Qnap-TS433

arm64: dts: rockchip: define cpu-supply on the Qnap-TS433

The TS433 seems to use a silergy,syr827 regulator for the cpu supply.
At least that is the compatible used in the vendor devicetree, though
it could very well also be another fan53555 clone.

Define the needed regulator node and hook up the cpu-supply to the
cpu cores.

Tested-by: Uwe Kleine-König <ukleinek@debian.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20240723195538.1133436-12-heiko@sntech.de
[ upstream commit: 99b36ba910d896bddbb9a190ca686c6d9cd0325f ]

(cherry picked from commit 2f0afd1a3cbf6f3192dc7a5c496affab718671b3)
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>