dt-bindings: trivial-devices: Add infineon,irps5401

Add Infineon IRPS5401 power supply to trivial devices. Driver has been
added long time ago by commit 9158411b ("hwmon: (pmbus) Add Infineon
IRPS5401 driver").

Signed-off-by: Michal Simek <michal.simek@amd.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/9673fc919c6785879975fb1830d5026d3cfa658a.1686233049.git.michal.simek@amd.com


Signed-off-by: Rob Herring <robh@kernel.org>