board: freescale: Remove <common.h> and add needed includes

Remove <common.h> from this board vendor directory and when needed
add missing include files directly.

Acked-by: Jason Liu <jason.hui.liu@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/include/asm/arch-imx8m/ddr.h b/arch/arm/include/asm/arch-imx8m/ddr.h
index c14855d..1f81d91 100644
--- a/arch/arm/include/asm/arch-imx8m/ddr.h
+++ b/arch/arm/include/asm/arch-imx8m/ddr.h
@@ -8,7 +8,7 @@
 
 #include <asm/io.h>
 #include <asm/types.h>
-#include <asm/arch/ddr.h>
+#include <asm/arch/imx-regs.h>
 
 #define DDRC_DDR_SS_GPR0		0x3d000000
 #define DDRC_IPS_BASE_ADDR_0		0x3f400000