driver: adc: microchip: Keep single adc driver for MEC devices

Deleted adc_mchp_xec.c and microchip,xec-adc.yaml file.
DTSI, yaml, CMakeLists.txt and Kconfig.xec files are
updated for compatible.

Signed-off-by: Manimaran A <manimaran.a@microchip.com>

dts/bindings/adc/microchip,xec-adc-v2.yaml

@@ -1,43 +0,0 @@
-# Copyright (c) 2019, Intel Corporation
-# Copyright (c) 2021, Microchip Technology Inc.
-# SPDX-License-Identifier: Apache-2.0
-
-description: Microchip XEC ADC
-
-compatible: "microchip,xec-adc-v2"
-
-include: [adc-controller.yaml, pinctrl-device.yaml]
-
-properties:
-  reg:
-    required: true
-
-  interrupts:
-    required: true
-
-  "#io-channel-cells":
-    const: 1
-
-  girqs:
-    type: array
-    required: true
-    description: Array of pairs of GIRQ number and bit position
-
-  pcrs:
-    type: array
-    required: true
-    description: ADC PCR register index and bit position
-
-  clktime:
-    type: int
-    required: true
-    description: ADC clock high & low time count value <1:255>
-
-  pinctrl-0:
-    required: true
-
-  pinctrl-names:
-    required: true
-
-io-channel-cells:
-  - input

dts/bindings/adc/microchip,xec-adc.yaml

@@ -1,4 +1,5 @@
 # Copyright (c) 2019, Intel Corporation
+# Copyright (c) 2021, Microchip Technology Inc.
 # SPDX-License-Identifier: Apache-2.0
 
 description: Microchip XEC ADC
@@ -17,6 +18,16 @@ properties:
   "#io-channel-cells":
     const: 1
 
+  girqs:
+    type: array
+    required: true
+    description: Array of pairs of GIRQ number and bit position
+
+  pcrs:
+    type: array
+    required: true
+    description: ADC PCR register index and bit position
+
   clktime:
     type: int
     required: true