dt-bindings: reset: Add Realtek RTD1295

Add a header with symbolic reset indices for Realtek RTD1295 SoC.
Naming was derived from reset-names in an OEM's Device Tree.

Acked-by: Rob Herring <robh@kernel.org>
[AF: Dropped RTD1295 specific binding definition, updated SPDX]
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Andreas Färber <afaerber@suse.de>