ARM: vf610: ddrmc: fix CR138 preprocessor define

According to the data sheet bits 10-8 are PHYDRAM_CK_EN. Fix mask
to allow setting PHYDRAM_CK_EN correctly.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
diff --git a/arch/arm/include/asm/arch-vf610/imx-regs.h b/arch/arm/include/asm/arch-vf610/imx-regs.h
index 08ba8e9..b7374bf 100644
--- a/arch/arm/include/asm/arch-vf610/imx-regs.h
+++ b/arch/arm/include/asm/arch-vf610/imx-regs.h
@@ -239,7 +239,7 @@
 #define DDRMC_CR132_RDLAT_ADJ(v)			((v) & 0x3f)
 #define DDRMC_CR137_PHYCTL_DL(v)			(((v) & 0xf) << 16)
 #define DDRMC_CR138_PHY_WRLV_MXDL(v)			(((v) & 0xffff) << 16)
-#define DDRMC_CR138_PHYDRAM_CK_EN(v)			(((v) & 0x8) << 8)
+#define DDRMC_CR138_PHYDRAM_CK_EN(v)			(((v) & 0x7) << 8)
 #define DDRMC_CR139_PHY_WRLV_RESPLAT(v)			(((v) & 0xff) << 24)
 #define DDRMC_CR139_PHY_WRLV_LOAD(v)			(((v) & 0xff) << 16)
 #define DDRMC_CR139_PHY_WRLV_DLL(v)			(((v) & 0xff) << 8)