drm/ast: Rename AST_IO_DAC_INDEX_WRITE to AST_IO_VGADWR

Rename AST_IO_DAC_INDEX_WRITE to AST_IO_VGADWR to align naming
in the driver with documentation. No functional changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231017083653.10063-7-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_drv.h

@@ -264,7 +264,7 @@ static inline bool __ast_gen_is_eq(struct ast_device *ast, unsigned long gen)
 #define AST_IO_VGAER			(0x43)
 #define AST_IO_VGASRI			(0x44)
 #define AST_IO_VGADRR			(0x47)
-#define AST_IO_DAC_INDEX_WRITE		(0x48)
+#define AST_IO_VGADWR			(0x48)
 #define AST_IO_DAC_DATA		        (0x49)
 #define AST_IO_GR_PORT			(0x4E)
 #define AST_IO_CRTC_PORT		(0x54)

drivers/gpu/drm/ast/ast_mode.c

@@ -55,7 +55,7 @@ static inline void ast_load_palette_index(struct ast_device *ast,
 				     u8 index, u8 red, u8 green,
 				     u8 blue)
 {
-	ast_io_write8(ast, AST_IO_DAC_INDEX_WRITE, index);
+	ast_io_write8(ast, AST_IO_VGADWR, index);
 	ast_io_read8(ast, AST_IO_VGASRI);
 	ast_io_write8(ast, AST_IO_DAC_DATA, red);
 	ast_io_read8(ast, AST_IO_VGASRI);