dts: bindings: st,lsm6dsl: unify I2C and SPI bindings

Use the same wording in description for both I2C and SPI variants to
improve consistency.

Create st,lsm6dsl-common.yaml to include common binding properties from I2C
and SPI variants.

Signed-off-by: Marcin Niestroj <m.niestroj@emb.dev>

dts/bindings/sensor/st,lsm6dsl-common.yaml

@@ -0,0 +1,10 @@
+# Copyright (c) 2017, Linaro Limited
+# Copyright (c) 2023, Marcin Niestroj
+# SPDX-License-Identifier: Apache-2.0
+
+include: sensor-device.yaml
+
+properties:
+  irq-gpios:
+    # This signal is active high when produced by the sensor
+    type: phandle-array

dts/bindings/sensor/st,lsm6dsl-i2c.yaml

@@ -1,13 +1,10 @@
 # Copyright (c) 2017, Linaro Limited
 # SPDX-License-Identifier: Apache-2.0
 
-description: STMicroelectronics LSM6DSL 6-axis accelerometer and gyrometer
+description: |
+  STMicroelectronics LSM6DSL 6-axis accelerometer and gyrometer accessed through
+  I2C bus
 
 compatible: "st,lsm6dsl"
 
-include: [sensor-device.yaml, i2c-device.yaml]
+include: ["i2c-device.yaml", "st,lsm6dsl-common.yaml"]
-
-properties:
-  irq-gpios:
-    # This signal is active high when produced by the sensor
-    type: phandle-array

dts/bindings/sensor/st,lsm6dsl-spi.yaml

@@ -2,14 +2,9 @@
 # SPDX-License-Identifier: Apache-2.0
 
 description: |
-    STMicroelectronics LSM6DSL 6-axis accelerometer and gyrometer accessed
+  STMicroelectronics LSM6DSL 6-axis accelerometer and gyrometer accessed through
-    through SPI bus
+  SPI bus
 
 compatible: "st,lsm6dsl"
 
-include: [sensor-device.yaml, spi-device.yaml]
+include: ["spi-device.yaml", "st,lsm6dsl-common.yaml"]
-
-properties:
-  irq-gpios:
-    # This signal is active high when produced by the sensor
-    type: phandle-array