cmd: Add a 'misc' command to access miscellaneous devices

Enable the command "misc" for accessing miscellaneous devices with
a MISC uclass driver. The command provides listing all MISC devices
as well as read and write functionalities via their drivers.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index cc7e931..11f299d 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1025,6 +1025,14 @@
 	  Print list of available block device drivers, and for each, the list
 	  of known block devices.
 
+config CMD_MISC
+	bool "misc"
+	depends on MISC
+	help
+	  Enable the command "misc" for accessing miscellaneous devices with
+	  a MISC uclass driver. The command provides listing all MISC devices
+	  as well as read and write functionalities via their drivers.
+
 config CMD_MMC
 	bool "mmc"
 	help