drm/ast: Rename AST_IO_MISC_PORT_READ to AST_IO_VGAMR_R

Rename AST_IO_MISC_PORT_READ to AST_IO_VGAMR_R 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/20231017083653.10063-12-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_drv.h

@@ -269,7 +269,7 @@ static inline bool __ast_gen_is_eq(struct ast_device *ast, unsigned long gen)
 #define AST_IO_VGAGRI			(0x4E)
 #define AST_IO_VGACRI			(0x54)
 #define AST_IO_VGAIR1_R			(0x5A)
-#define AST_IO_MISC_PORT_READ		(0x4C)
+#define AST_IO_VGAMR_R			(0x4C)
 
 #define AST_IO_MM_OFFSET		(0x380)
 

drivers/gpu/drm/ast/ast_mode.c

@@ -531,7 +531,7 @@ static void ast_set_sync_reg(struct ast_device *ast,
 {
 	u8 jreg;
 
-	jreg  = ast_io_read8(ast, AST_IO_MISC_PORT_READ);
+	jreg  = ast_io_read8(ast, AST_IO_VGAMR_R);
 	jreg &= ~0xC0;
 	if (vbios_mode->enh_table->flags & NVSync)
 		jreg |= 0x80;