[ARM] S3C64XX: Mask the pll values correctly

Correct the PLL field masks to ensure the PLL functions return the
right value.
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
[ben-linux@fluff.org: improve the description text]
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

arch/arm/plat-s3c64xx/include/plat/pll.h

@@ -12,9 +12,9 @@
  * published by the Free Software Foundation.
 */
 
-#define S3C6400_PLL_MDIV_MASK	((1 << (25-16)) - 1)
-#define S3C6400_PLL_PDIV_MASK	((1 << (13-8)) - 1)
-#define S3C6400_PLL_SDIV_MASK	((1 << (2-0)) - 1)
+#define S3C6400_PLL_MDIV_MASK	((1 << (25-16+1)) - 1)
+#define S3C6400_PLL_PDIV_MASK	((1 << (13-8+1)) - 1)
+#define S3C6400_PLL_SDIV_MASK	((1 << (2-0+1)) - 1)
 #define S3C6400_PLL_MDIV_SHIFT	(16)
 #define S3C6400_PLL_PDIV_SHIFT	(8)
 #define S3C6400_PLL_SDIV_SHIFT	(0)