test:dm:fix typo

Fix typos in the 'test/dm' directory.

Signed-off-by: Yuepeng Xing <xingyuepeng@eswincomputing.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/remoteproc.c b/test/dm/remoteproc.c
index b5e9f9d..7a8ff47 100644
--- a/test/dm/remoteproc.c
+++ b/test/dm/remoteproc.c
@@ -139,7 +139,7 @@
 		0x20, 0x00, 0x00, 0x00,
 		/* memsz = filesz */
 		0x20, 0x00, 0x00, 0x00,
-		/* flags : readable and exectuable */
+		/* flags : readable and executable */
 		0x05, 0x00, 0x00, 0x00,
 		/* padding */
 		0x00, 0x00, 0x00, 0x00,