dm: Change CMD_DM enabling

CMD_DM is used for debug purpose and it shouldn't be enabled by default
via Kconfig. Unfortunately this is in the tree for quite a long time
that's why solution is to use imply DM for all targets which are
enabling DM.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index 7967fa5..bf1b4a9 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -50,6 +50,7 @@
 	select DM
 	select OF_CONTROL
 	select SUPPORT_OF_CONTROL
+	imply CMD_DM
 
 config PPC
 	bool "PowerPC architecture"
@@ -77,6 +78,7 @@
 	select LZO
 	select SPI
 	select SUPPORT_OF_CONTROL
+	imply CMD_DM
 	imply CMD_GETTIME
 	imply CMD_HASH
 	imply CMD_IO
@@ -107,6 +109,7 @@
 	select USE_PRIVATE_LIBGCC
 	select X86_TSC_TIMER
 	imply BLK
+	imply CMD_DM
 	imply CMD_FPGA_LOADMK
 	imply CMD_GETTIME
 	imply CMD_IO