dt-bindings: cp110: add sdio clock to cp-110 system controller

This patch updates the documentation according to the change made in the
patch "clk: mvebu: cp110: add sdio clock to cp-110 system controller"
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>

Documentation/devicetree/bindings/arm/marvell/cp110-system-controller0.txt

@@ -34,6 +34,7 @@ The following clocks are available:
    - 0 2	EIP
    - 0 3	Core
    - 0 4	NAND core
+   - 0 5	SDIO core
  - Gatable clocks
    - 1 0	Audio
    - 1 1	Comm Unit