TI: DaVinci DM646x: Update flag used to represent DM646x SOC's

In the DaVinci specific code, we use both CONFIG_SOC_DM646X and
CONFIG_SOC_DM646x to represent DM646x specific code.
This patch changes occurrences of CONFIG_SOC_DM646x to
CONFIG_SOC_DM646X. This is because for DM644x series of SOCs we use
the flag CONFIG_SOC_DM644X. We want some uniformity.

Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
Acked-by: Tom Rix <Tom.Rix@windriver.com>

include/asm-arm/arch-davinci/emac_defs.h

@@ -50,7 +50,7 @@
 #define EMAC_MDIO_BASE_ADDR		(0x01c84000)
 #endif
 
-#ifdef CONFIG_SOC_DM646x
+#ifdef CONFIG_SOC_DM646X
 /* MDIO module input frequency */
 #define EMAC_MDIO_BUS_FREQ		76500000
 /* MDIO clock output frequency */
@@ -283,7 +283,7 @@ typedef struct  {
 
 /* EMAC Wrapper Registers Structure */
 typedef struct  {
-#if defined(CONFIG_SOC_DM646x) || defined(CONFIG_SOC_DM365)
+#if defined(CONFIG_SOC_DM646X) || defined(CONFIG_SOC_DM365)
 	dv_reg		IDVER;
 	dv_reg		SOFTRST;
 	dv_reg		EMCTRL;

include/asm-arm/arch-davinci/nand_defs.h

@@ -28,7 +28,7 @@
 
 #include <asm/arch/hardware.h>
 
-#ifdef CONFIG_SOC_DM646x
+#ifdef CONFIG_SOC_DM646X
 #define	MASK_CLE	0x80000
 #define	MASK_ALE	0x40000
 #else