dt-bindings: Remove PicoXcell bindings

Picochip picoXcell device tree bindings.

========================================

Required root node properties:

    - compatible:

	- "picochip,pc7302-pc3x3" : PC7302 development board with PC3X3 device.

	- "picochip,pc7302-pc3x2" : PC7302 development board with PC3X2 device.

	- "picochip,pc3x3" : picoXcell PC3X3 device based board.

	- "picochip,pc3x2" : picoXcell PC3X2 device based board.

Timers required properties:

    - compatible = "picochip,pc3x2-timer"

    - interrupts : The single IRQ line for the timer.

    - clock-freq : The frequency in HZ of the timer.

    - reg : The register bank for the timer.

Note: two timers are required - one for the scheduler clock and one for the

event tick/NOHZ.

VIC required properties:

    - compatible = "arm,pl192-vic".

    - interrupt-controller.

    - reg : The register bank for the device.

    - #interrupt-cells : Must be 1.

Picochip picoXcell SPAcc (Security Protocol Accelerator) bindings

Picochip picoXcell devices contain crypto offload engines that may be used for

IPSEC and femtocell layer 2 ciphering.

Required properties:

  - compatible : "picochip,spacc-ipsec" for the IPSEC offload engine

    "picochip,spacc-l2" for the femtocell layer 2 ciphering engine.

  - reg : Offset and length of the register set for this device

  - interrupts : The interrupt line from the SPAcc.

  - ref-clock : The input clock that drives the SPAcc.

Example SPAcc node:

spacc@10000 {

	compatible = "picochip,spacc-ipsec";

	reg = <0x100000 0x10000>;

	interrupt-parent = <&vic0>;

	interrupts = <24>;

	ref-clock = <&ipsec_clk>, "ref";

};

  Use "cdns,sam9x60-macb" for Microchip sam9x60 SoC.

  Use "cdns,np4-macb" for NP4 SoC devices.

  Use "cdns,at32ap7000-macb" for other 10/100 usage or use the generic form: "cdns,macb".

  Use "cdns,pc302-gem" for Picochip picoXcell pc302 and later devices based on

  the Cadence GEM, or the generic form: "cdns,gem".

  Use "atmel,sama5d2-gem" for the GEM IP (10/100) available on Atmel sama5d2 SoCs.

  Use "atmel,sama5d3-macb" for the 10/100Mbit IP available on Atmel sama5d3 SoCs.

  Use "atmel,sama5d3-gem" for the Gigabit IP available on Atmel sama5d3 SoCs.

  clock-frequency: true

  clock-freq:

    $ref: "/schemas/types.yaml#/definitions/uint32"

    description: |

      Has the same meaning as the 'clock-frequency' property - timer clock

      frequency in HZ, but is defined only for the backwards compatibility

      with the picoxcell platform.

additionalProperties: false

required: