dt-bindings: i2c: Update DT binding docs to support SiFive FU740 SoC

Add new compatible strings to the DT binding documents to support SiFive
FU740-C000.
Signed-off-by: Yash Shah <yash.shah@sifive.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Documentation/devicetree/bindings/i2c/i2c-ocores.txt

@@ -5,8 +5,12 @@ Required properties:
                     "aeroflexgaisler,i2cmst"
                     "sifive,fu540-c000-i2c", "sifive,i2c0"
                     For Opencore based I2C IP block reimplemented in
-                    FU540-C000 SoC. Please refer to sifive-blocks-ip-versioning.txt
-                    for additional details.
+                    FU540-C000 SoC.
+                    "sifive,fu740-c000-i2c", "sifive,i2c0"
+                    For Opencore based I2C IP block reimplemented in
+                    FU740-C000 SoC.
+                    Please refer to sifive-blocks-ip-versioning.txt for
+                    additional details.
 - reg             : bus address start and address range size of device
 - clocks          : handle to the controller clock; see the note below.
                     Mutually exclusive with opencores,ip-clock-frequency