dm: Fix CMD_DM enabling

The patch "dm: Change CMD_DM enabling"
(sha1: 08a00cba06a7e608ae65e3d7ea225cf8c639429d) was incorrectly updated
and PICO_IMX7D is missing imply CMD_DM and WARP7 has it twice.
This patch is fixing it.

Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/mach-imx/mx7/Kconfig b/arch/arm/mach-imx/mx7/Kconfig
index 1acd7f3..232f332 100644
--- a/arch/arm/mach-imx/mx7/Kconfig
+++ b/arch/arm/mach-imx/mx7/Kconfig
@@ -43,6 +43,7 @@
 	select DM_THERMAL
 	select MX7D
 	select SUPPORT_SPL
+	imply CMD_DM
 
 config TARGET_WARP7
 	bool "warp7"
@@ -51,7 +52,6 @@
 	select DM_THERMAL
 	select MX7D
 	imply CMD_DM
-	imply CMD_DM
 
 config TARGET_COLIBRI_IMX7
 	bool "Support Colibri iMX7S/iMX7D modules"