arm: controlcenterdc: Add spi-flash compatible strings

Since kirkwook SPI was recently converted to DM, add compatible strings
to the SPI flash devices to make them work with the new driver.

Signed-off-by: Mario Six <mario.six@gdsys.cc>

arch/arm/dts/armada-38x-controlcenterdc.dts

@@ -92,14 +92,14 @@
 				spi-flash@0 {
 					#address-cells = <1>;
 					#size-cells = <1>;
-					compatible = "n25q016a";
+					compatible = "n25q016a", "spi-flash";
 					reg = <0>; /* Chip select 0 */
 					spi-max-frequency = <108000000>;
 				};
 				spi-flash@1 {
 					#address-cells = <1>;
 					#size-cells = <1>;
-					compatible = "n25q128a11";
+					compatible = "n25q128a11", "spi-flash";
 					reg = <1>; /* Chip select 1 */
 					spi-max-frequency = <108000000>;
 					u-boot,dm-pre-reloc;