ARM: dts: imx7d-sdb-reva: Add revision in board compatible string

i.MX7D SDB Rev-A board should use its own board compatible
string instead of default i.MX7D SDB board.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d-sdb-reva.dts

@@ -7,6 +7,9 @@
 #include "imx7d-sdb.dts"
 
 / {
+	model = "Freescale i.MX7 SabreSD RevA Board";
+	compatible = "fsl,imx7d-sdb-reva", "fsl,imx7d";
+
 	reg_usb_otg2_vbus: regulator-usb-otg2-vbus {
 		pinctrl-0 = <&pinctrl_usb_otg2_vbus_reg_reva>;
 		gpio = <&gpio4 7 GPIO_ACTIVE_HIGH>;