dt-bindings: rtc: Drop non-trivial duplicate compatibles

Several compatibles documented in trivial-rtc.yaml are documented
elsewhere and are not trivial, so drop them.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240910234431.1043923-1-robh@kernel.org


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>