dt-bindings: mtd: fixed-partitions: Fix "compression" typo

The example erroneously has "compress" property rather than the
documented "compression" property.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20241113225632.1783241-1-robh@kernel.org


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