dt-bindings: dma: pl08x: Do not use plural form of a proper noun PrimeCell

As a proper noun PrimeCell is a single entity and it can not have a plural
form, fix the typo.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251225181519.1401953-1-vz@mleia.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: vzapolskiy

Documentation/devicetree/bindings/dma/arm-pl08x.yaml

@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/dma/arm-pl08x.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: ARM PrimeCells PL080 and PL081 and derivatives DMA controller
+title: ARM PrimeCell PL080 and PL081 and derivatives DMA controller
 
 maintainers:
   - Vinod Koul <vkoul@kernel.org>