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

deepin inclusion
category: bugfix

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

Log:
2025-11-20T03:34:29.9620208Z In file included from drivers/gpu/drm/smidrm/ddk770/ddk770_helper.c:13:
2025-11-20T03:34:29.9622741Z drivers/gpu/drm/smidrm/ddk770/ddk770_ddkdebug.h:12:9: error: '_DDk770_DDKDEBUG_H_' is used as a header guard here, followed by #define of a different macro [-Werror,-Wheader-guard]
2025-11-20T03:34:29.9624475Z    12 | #ifndef _DDk770_DDKDEBUG_H_
2025-11-20T03:34:29.9625208Z       |         ^~~~~~~~~~~~~~~~~~~
2025-11-20T03:34:29.9626716Z drivers/gpu/drm/smidrm/ddk770/ddk770_ddkdebug.h:13:9: note: '_DDK770_DDKDEBUG_H_' is defined here; did you mean '_DDk770_DDKDEBUG_H_'?
2025-11-20T03:34:29.9647909Z    13 | #define _DDK770_DDKDEBUG_H_
2025-11-20T03:34:29.9648757Z       |         ^~~~~~~~~~~~~~~~~~~
2025-11-20T03:34:29.9649466Z       |         _DDk770_DDKDEBUG_H_
2025-11-20T03:34:29.9650159Z 1 error generated.

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

Author: opsiff

drivers/gpu/drm/smidrm/ddk770/ddk770_ddkdebug.h

@@ -9,7 +9,7 @@
 *  This file contains the definitions for the SMI DDK debugging.
 * 
 *******************************************************************/
-#ifndef _DDk770_DDKDEBUG_H_
+#ifndef _DDK770_DDKDEBUG_H_
 #define _DDK770_DDKDEBUG_H_
 
 #ifdef DDKDEBUG