ARM: uniphier: rename DTCR_RNKEN_* register bit to DTCR_RANKEN_*

The bit 27-24 of the DTCR register is described as RANKEN in the
DDR PHY databook.  Follow this abbreviation.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/ddrphy/ddrphy-training.c b/arch/arm/mach-uniphier/ddrphy/ddrphy-training.c
index f1a2341..b4d369a 100644
--- a/arch/arm/mach-uniphier/ddrphy/ddrphy-training.c
+++ b/arch/arm/mach-uniphier/ddrphy/ddrphy-training.c
@@ -32,8 +32,8 @@
 	/* Use Multi-Purpose Register for DQS gate training */
 	tmp |= DTCR_DTMPR;
 	/* Specify the rank enabled for data-training */
-	tmp &= ~DTCR_RNKEN_MASK;
-	tmp |= (1 << (DTCR_RNKEN_SHIFT + rank)) & DTCR_RNKEN_MASK;
+	tmp &= ~DTCR_RANKEN_MASK;
+	tmp |= (1 << (DTCR_RANKEN_SHIFT + rank)) & DTCR_RANKEN_MASK;
 	writel(tmp, p);
 }