cmd: mem: Add a command to fill the memory with random data

This command fills the memory with data produced by rand().

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index ec746fe..175c6ad 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -571,6 +571,13 @@
 	    base - print or set address offset
 	    loop - initialize loop on address range
 
+config CMD_RANDOM
+	bool "random"
+	default y
+	depends on CMD_MEMORY && (LIB_RAND || LIB_HW_RAND)
+	help
+	  random - fill memory with random data
+
 config CMD_MEMTEST
 	bool "memtest"
 	help