dts/bindings: Fix lis2dh12 and lis3dh

LIS3DH and LIS2DH12 devices share the same driver with
LIS2DH device. So, the bindings are reusing the same
common structure (as LSM30AGR-ACCEL and LSM303DLHC-ACCEL
devices are already doing)

Signed-off-by: Armando Visconti <armando.visconti@st.com>
diff --git a/dts/bindings/sensor/st,lis2dh12-i2c.yaml b/dts/bindings/sensor/st,lis2dh12-i2c.yaml
index 8f02972..8b78344 100644
--- a/dts/bindings/sensor/st,lis2dh12-i2c.yaml
+++ b/dts/bindings/sensor/st,lis2dh12-i2c.yaml
@@ -5,9 +5,4 @@
 
 compatible: "st,lis2dh12"
 
-include: i2c-device.yaml
-
-properties:
-    irq-gpios:
-      required: false
-      type: phandle-array
+include: ["i2c-device.yaml", "st,lis2dh-common.yaml"]
diff --git a/dts/bindings/sensor/st,lis3dh-i2c.yaml b/dts/bindings/sensor/st,lis3dh-i2c.yaml
index 9094f18..67018c1 100644
--- a/dts/bindings/sensor/st,lis3dh-i2c.yaml
+++ b/dts/bindings/sensor/st,lis3dh-i2c.yaml
@@ -5,9 +5,4 @@
 
 compatible: "st,lis3dh"
 
-include: i2c-device.yaml
-
-properties:
-    irq-gpios:
-      required: false
-      type: phandle-array
+include: ["i2c-device.yaml", "st,lis2dh-common.yaml"]