dt-bindings: Add TI and Infineon VR Controllers as trivial devices

Add Texas Instruments Dual channel DCAP+ multiphase controllers:
TPS53679, TPS53688, and Infineon Multi-phase Digital VR controllers
XDPE12284, XDPE12254 as trivial devices.

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rob Herring <robh@kernel.org>