dt-bindings: i2c: i2c-stm32f7: add st,stm32mp15-i2c compatible

Add a new stm32mp15 specific compatible to handle FastMode+
registers which are different on the stm32mp15 compared
to the stm32f7 or stm32h7.
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/i2c/st,stm32-i2c.yaml

@@ -17,6 +17,7 @@ allOf:
           contains:
             enum:
               - st,stm32f7-i2c
+              - st,stm32mp15-i2c
     then:
       properties:
         i2c-scl-rising-time-ns:
@@ -52,6 +53,7 @@ properties:
     enum:
       - st,stm32f4-i2c
       - st,stm32f7-i2c
+      - st,stm32mp15-i2c
 
   reg:
     maxItems: 1
@@ -121,12 +123,12 @@ examples:
           clocks = <&rcc 1 CLK_I2C1>;
       };
 
-    //Example 3 (with st,stm32f7-i2c compatible on stm32mp)
+    //Example 3 (with st,stm32mp15-i2c compatible on stm32mp)
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/clock/stm32mp1-clks.h>
     #include <dt-bindings/reset/stm32mp1-resets.h>
       i2c@40013000 {
-          compatible = "st,stm32f7-i2c";
+          compatible = "st,stm32mp15-i2c";
           #address-cells = <1>;
           #size-cells = <0>;
           reg = <0x40013000 0x400>;