cmd: mdc/mwc: normalize disjoint MX_CYCLIC usage

Both CMD_MX_CYCLIC and MX_CYCLIC are in use and defined in Kconfig,
but only the non-CMD version currently does anything. This changes all
usages to prefer the CMD_MX_CYCLIC option (since it's only affecting
addition of the commands), and switches defconfigs using the non-CMD
version to use the CMD version.

Signed-off-by: Joel Johnson <mrjoel@lixil.net>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index e6ba570..6403bc4 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -702,7 +702,7 @@
 	    base - print or set address offset
 	    loop - initialize loop on address range
 
-config MX_CYCLIC
+config CMD_MX_CYCLIC
 	bool "Enable cyclic md/mw commands"
 	depends on CMD_MEMORY
 	help
@@ -737,12 +737,6 @@
 
 endif
 
-config CMD_MX_CYCLIC
-	bool "mdc, mwc"
-	help
-	  mdc - memory display cyclic
-	  mwc - memory write cyclic
-
 config CMD_SHA1SUM
 	bool "sha1sum"
 	select SHA1