Move console definitions into a new console.h file

The console includes a global variable and several functions that are only
used by a small subset of U-Boot files. Before adding more functions, move
the definitions into their own header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cli.c b/common/cli.c
index b6ae80a..fbcd339 100644
--- a/common/cli.c
+++ b/common/cli.c
@@ -12,6 +12,7 @@
 #include <common.h>
 #include <cli.h>
 #include <cli_hush.h>
+#include <console.h>
 #include <fdtdec.h>
 #include <malloc.h>