apalis_imx6: boot env configuration updates

1. Drop legacy emmcboot wrapper from env.
2. Change the "boot try" order. Default one is: SD -> eMMC -> USB -> DHCP
3. Drop DFU defines

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
diff --git a/include/configs/apalis_imx6.h b/include/configs/apalis_imx6.h
index 6fc7c39..38d0a6e 100644
--- a/include/configs/apalis_imx6.h
+++ b/include/configs/apalis_imx6.h
@@ -93,9 +93,9 @@
 
 #ifndef CONFIG_SPL_BUILD
 #define BOOT_TARGET_DEVICES(func) \
-	func(MMC, mmc, 0) \
 	func(MMC, mmc, 1) \
 	func(MMC, mmc, 2) \
+	func(MMC, mmc, 0) \
 	func(USB, usb, 0) \
 	func(DHCP, dhcp, na)
 #include <config_distro_bootcmd.h>
@@ -105,14 +105,6 @@
 #define BOOTENV
 #endif /* CONFIG_SPL_BUILD */
 
-#define DFU_ALT_EMMC_INFO \
-	"u-boot.imx raw 0x2 0x3ff mmcpart 0;" \
-	"boot part 0 1;" \
-	"rootfs part 0 2;" \
-	"zImage fat 0 1;" \
-	"imx6q-apalis-eval.dtb fat 0 1;" \
-	"imx6q-apalis-cam-eval.dtb fat 0 1"
-
 #define UBOOT_UPDATE \
 	"uboot_hwpart=1\0" \
 	"uboot_blk=8a\0" \
@@ -124,23 +116,6 @@
 	"update_spl=run set_blkcnt && mmc dev 0 ${uboot_hwpart} && " \
 		"mmc write ${loadaddr} ${uboot_spl_blk} ${blkcnt}\0"
 
-#define EMMC_BOOTCMD \
-	"set_emmcargs=setenv emmcargs ip=off root=PARTUUID=${uuid} " \
-		"ro,noatime rootfstype=ext4 rootwait\0" \
-	"emmcboot=run setup; run emmcfinduuid; run set_emmcargs; " \
-		"setenv bootargs ${defargs} ${emmcargs} ${setupargs} " \
-		"${vidargs}; echo Booting from internal eMMC chip...; "	\
-		"run emmcdtbload; load mmc ${emmcdev}:${emmcbootpart} " \
-		"${kernel_addr_r} ${boot_file} && run fdt_fixup && " \
-		"bootz ${kernel_addr_r} ${dtbparam}\0" \
-	"emmcbootpart=1\0" \
-	"emmcdev=0\0" \
-	"emmcdtbload=setenv dtbparam; load mmc ${emmcdev}:${emmcbootpart} " \
-		"${fdt_addr_r} ${fdt_file} && " \
-		"setenv dtbparam \" - ${fdt_addr_r}\" && true\0" \
-	"emmcfinduuid=part uuid mmc ${mmcdev}:${emmcrootpart} uuid\0" \
-	"emmcrootpart=2\0"
-
 #define MEM_LAYOUT_ENV_SETTINGS \
 	"bootm_size=0x20000000\0" \
 	"fdt_addr_r=0x12100000\0" \
@@ -174,8 +149,6 @@
 	"boot_file=zImage\0" \
 	"console=ttymxc0\0" \
 	"defargs=enable_wait_mode=off vmalloc=400M\0" \
-	"dfu_alt_info=" DFU_ALT_EMMC_INFO "\0" \
-	EMMC_BOOTCMD \
 	"fdt_file=" FDT_FILE "\0" \
 	"fdt_fixup=;\0" \
 	MEM_LAYOUT_ENV_SETTINGS \