cmd: add conitrace command

The 'conitrace' command prints the codes received from the console input as
hexadecimal numbers.

This developer utility is useful for testing the handling of special keys
by keyboard drivers.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 13d4c99..cf97a0f 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1338,6 +1338,12 @@
 	help
 	  Enable the "icache" and "dcache" commands
 
+config CMD_CONITRACE
+	bool "conitrace - trace console input codes"
+	help
+	  Enable the 'conitrace' command which displays the codes received
+	  from the console input as hexadecimal numbers.
+
 config CMD_DISPLAY
 	bool "Enable the 'display' command, for character displays"
 	help