mx6cuboxi: Use more standard namings for fdt variables

README file suggests to use 'fdtfile' for the dtb file name and
'fdt_addr_r' for the dtb address in RAM, so do as suggested.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/mx6cuboxi.h

@@ -88,8 +88,8 @@
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"script=boot.scr\0" \
 	"image=zImage\0" \
-	"fdt_file=" CONFIG_DEFAULT_FDT_FILE "\0" \
-	"fdt_addr=0x18000000\0" \
+	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
+	"fdt_addr_r=0x18000000\0" \
 	"boot_fdt=try\0" \
 	"ip_dyn=yes\0" \
 	"console=" CONFIG_CONSOLE_DEV "\0" \
@@ -117,12 +117,12 @@
 	"bootscript=echo Running bootscript from mmc ...; " \
 		"source\0" \
 	"loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}\0" \
-	"loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}\0" \
+	"loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr_r} ${fdtfile}\0" \
 	"mmcboot=echo Booting from mmc ...; " \
 		"run mmcargs; " \
 		"if test ${boot_fdt} = yes || test ${boot_fdt} = try; then " \
 			"if run loadfdt; then " \
-				"bootz ${loadaddr} - ${fdt_addr}; " \
+				"bootz ${loadaddr} - ${fdt_addr_r}; " \
 			"else " \
 				"if test ${boot_fdt} = try; then " \
 					"bootz; " \
@@ -145,8 +145,8 @@
 		"fi; " \
 		"${get_cmd} ${image}; " \
 		"if test ${boot_fdt} = yes || test ${boot_fdt} = try; then " \
-			"if ${get_cmd} ${fdt_addr} ${fdt_file}; then " \
-				"bootz ${loadaddr} - ${fdt_addr}; " \
+			"if ${get_cmd} ${fdt_addr_r} ${fdtfile}; then " \
+				"bootz ${loadaddr} - ${fdt_addr_r}; " \
 			"else " \
 				"if test ${boot_fdt} = try; then " \
 					"bootz; " \