warp7: Remove duplicated "mmc dev" command

The "mmc dev ${mmcdev}" command is done twice.

Remove one ocurrence to avoid the duplication.

Signed-off-by: Fabio Estevam <festevam@denx.de>
diff --git a/configs/warp7_defconfig b/configs/warp7_defconfig
index b349d54..b72332c 100644
--- a/configs/warp7_defconfig
+++ b/configs/warp7_defconfig
@@ -20,7 +20,7 @@
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_USE_BOOTCOMMAND=y
-CONFIG_BOOTCOMMAND="mmc dev ${mmcdev};mmc dev ${mmcdev}; if mmc rescan; then run do_bootscript_hab;if run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot; fi; fi; fi"
+CONFIG_BOOTCOMMAND="mmc dev ${mmcdev}; if mmc rescan; then run do_bootscript_hab;if run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot; fi; fi; fi"
 # CONFIG_BOARD_EARLY_INIT_F is not set
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_BOOTD is not set