deepin: drm: smidrm: ddk770: fix typo in cursor.h

deepin inclusion
category: bugfix

similar to ddk768_cursor.h and etc.
modified k to K to fix it.

Log:
2025-11-19T06:44:10.7451497Z In file included from drivers/gpu/drm/smidrm/hw770.c:11:
2025-11-19T06:44:10.7456125Z drivers/gpu/drm/smidrm/ddk770/ddk770_cursor.h:12:9: error: '_DDk770_CURSOR_H_' is used as a header guard here, followed by #define of a different macro [-Werror,-Wheader-guard]
2025-11-19T06:44:10.7469716Z    12 | #ifndef _DDk770_CURSOR_H_
2025-11-19T06:44:10.7470443Z       |         ^~~~~~~~~~~~~~~~~
2025-11-19T06:44:10.7472019Z drivers/gpu/drm/smidrm/ddk770/ddk770_cursor.h:13:9: note: '_DDK770_CURSOR_H_' is defined here; did you mean '_DDk770_CURSOR_H_'?
2025-11-19T06:44:10.7473211Z    13 | #define _DDK770_CURSOR_H_
2025-11-19T06:44:10.7473748Z       |         ^~~~~~~~~~~~~~~~~
2025-11-19T06:44:10.7474277Z       |         _DDk770_CURSOR_H_

Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: opsiff

drivers/gpu/drm/smidrm/ddk770/ddk770_cursor.h

@@ -9,7 +9,7 @@
 *  This file contains the definitions for the cursor functions.
 * 
 *******************************************************************/
-#ifndef _DDk770_CURSOR_H_
+#ifndef _DDK770_CURSOR_H_
 #define _DDK770_CURSOR_H_
 
 #include "ddk770_mode.h"