dt-bindings: clock: Remove unused fujitsu,mb86s70-crg11 binding

The fujitsu,mb86s70-crg11 binding is unused. The driver for it was removed
in 2017. It's not used for Synquacer DT either like some other mb86s70
bindings are.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/fujitsu,mb86s70-crg11.txt

···
-Fujitsu CRG11 clock driver bindings
------------------------------------
-
-Required properties :
-- compatible : Shall contain "fujitsu,mb86s70-crg11"
-- #clock-cells : Shall be 3 {cntrlr domain port}
-
-The consumer specifies the desired clock pointing to its phandle.
-
-Example:
-
-	clock: crg11 {
-		compatible = "fujitsu,mb86s70-crg11";
-		#clock-cells = <3>;
-	};
-
-	mhu: mhu0@2b1f0000 {
-		#mbox-cells = <1>;
-		compatible = "arm,mhu";
-		reg = <0 0x2B1F0000 0x1000>;
-		interrupts = <0 36 4>, /* LP Non-Sec */
-			     <0 35 4>, /* HP Non-Sec */
-			     <0 37 4>; /* Secure */
-		clocks = <&clock 0 2 1>; /* Cntrlr:0 Domain:2 Port:1 */
-		clock-names = "clk";
-	};