ARM: dts: stm32: Enable I2C2 on DHCOM PDK2 carrier board

The I2C2 is routed out to header X21, enable it to make it available.
Add a comment to I2C5, which is routed to header X22 right next to it.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c-dhcom-pdk2.dts

@@ -96,7 +96,19 @@ phy0: ethernet-phy@1 {
 	};
 };
 
-&i2c5 {
+&i2c2 {	/* Header X22 */
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c2_pins_a>;
+	i2c-scl-rising-time-ns = <185>;
+	i2c-scl-falling-time-ns = <20>;
+	status = "okay";
+	/* spare dmas for other usage */
+	/delete-property/dmas;
+	/delete-property/dma-names;
+	status = "okay";
+};
+
+&i2c5 {	/* Header X21 */
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c5_pins_a>;
 	i2c-scl-rising-time-ns = <185>;