ARM: mmp2: DT: be compatible with mrvl,mmp2

There are more boards that can work with mmp2-dt than just Brownstone.
The OLPC XO-1.75 device tree root is compatible with "mrvl,mmp2" only.

The "mrvl,mmp2-brownstone" string is safe to remove: the Brownstone
device tree contains the "mrvl,mmp2" compatible string too.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-mmp/mmp2-dt.c

@@ -31,7 +31,7 @@ static void __init mmp_init_time(void)
 }
 
 static const char *const mmp2_dt_board_compat[] __initconst = {
-	"mrvl,mmp2-brownstone",
+	"mrvl,mmp2",
 	NULL,
 };