dt-bindings: timer: nxp,lpc3220-timer: Convert to dtschema

Convert the NXP LPC3220 timer bindings to yaml format.
Add missing resets property as it is already being used in dts.

Cc: Daniel Baluta <[e-mail]>
Signed-off-by: Animesh Agarwal <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring (Arm) <[e-mail]>

Documentation/devicetree/bindings/timer/nxp,lpc3220-timer.txt

···
-* NXP LPC3220 timer
-
-The NXP LPC3220 timer is used on a wide range of NXP SoCs. This
-includes LPC32xx, LPC178x, LPC18xx and LPC43xx parts.
-
-Required properties:
-- compatible:
-	Should be "nxp,lpc3220-timer".
-- reg:
-	Address and length of the register set.
-- interrupts:
-	Reference to the timer interrupt
-- clocks:
-	Should contain a reference to timer clock.
-- clock-names:
-	Should contain "timerclk".
-
-Example:
-
-timer1: timer@40085000 {
-	compatible = "nxp,lpc3220-timer";
-	reg = <0x40085000 0x1000>;
-	interrupts = <13>;
-	clocks = <&ccu1 CLK_CPU_TIMER1>;
-	clock-names = "timerclk";
-};

Documentation/devicetree/bindings/timer/nxp,lpc3220-timer.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/nxp,lpc3220-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP LPC3220 timer
+
+maintainers:
+  - Animesh Agarwal <[e-mail]>
+
+description: |
+  The NXP LPC3220 timer is used on a wide range of NXP SoCs. This includes
+  LPC32xx, LPC178x, LPC18xx and LPC43xx parts.
+
+properties:
+  compatible:
+    const: nxp,lpc3220-timer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: timerclk
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/lpc32xx-clock.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    timer@4004c000 {
+        compatible = "nxp,lpc3220-timer";
+        reg = <0x4004c000 0x1000>;
+        interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
+        clocks = <&clk LPC32XX_CLK_TIMER1>;
+        clock-names = "timerclk";
+    };