ARM: mach-mxs: Remove board entries in dt_board_compat

There is no need for adding board related entries into dt_board_compat.

Leave only the SoC entry.

This way we do not need to patch a C file when adding dt support for
a new board.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-mxs/mach-mxs.c

@@ -289,19 +289,11 @@ static void __init mxs_machine_init(void)
 }
 
 static const char *imx23_dt_compat[] __initdata = {
-	"fsl,imx23-evk",
-	"fsl,stmp378x_devb"
-	"olimex,imx23-olinuxino",
 	"fsl,imx23",
 	NULL,
 };
 
 static const char *imx28_dt_compat[] __initdata = {
-	"bluegiga,apx4devkit",
-	"crystalfontz,cfa10036",
-	"denx,m28evk",
-	"fsl,imx28-evk",
-	"karo,tx28",
 	"fsl,imx28",
 	NULL,
 };