ARM: imx: add support for i.MX 7Solo

Add device tree compatible string "imx7s" for i.MX 7Solo.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/mach-imx7d.c

@@ -107,6 +107,7 @@ static void __init imx7d_init_irq(void)
 
 static const char *const imx7d_dt_compat[] __initconst = {
 	"fsl,imx7d",
+	"fsl,imx7s",
 	NULL,
 };