dt-bindings: reset: Add Realtek RTD1195

Add a header with symbolic reset indices for Realtek RTD1195 SoC.
Naming was derived from BSP register description headers.

Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: James Tai <james.tai@realtek.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>