malta: enable HUSH parser

The malta board is used for development and thus the shell is interacted
with often. Enable HUSH to make the experience a little more pleasant.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/include/configs/malta.h b/include/configs/malta.h
index ed5da6c..4e64cc9 100644
--- a/include/configs/malta.h
+++ b/include/configs/malta.h
@@ -71,6 +71,7 @@
 					 sizeof(CONFIG_SYS_PROMPT) + 16)
 #define CONFIG_SYS_MAXARGS		16
 
+#define CONFIG_SYS_HUSH_PARSER
 #define CONFIG_AUTO_COMPLETE
 #define CONFIG_CMDLINE_EDITING