drm/ast: Enable the supporting of wide screen on AST2600

Enable the supporting of wide sscreen on AST2600, so that the resolution
of 16:9 and 16:10 are able to be selected on Display Settings.

Signed-off-by: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20211229082749.5415-1-kuohsiang_chou@aspeedtech.com

drivers/gpu/drm/ast/ast_main.c

@@ -209,6 +209,8 @@ static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 			if (ast->chip == AST2500 &&
 			    scu_rev == 0x100)           /* ast2510 */
 				ast->support_wide_screen = true;
+			if (ast->chip == AST2600)		/* ast2600 */
+				ast->support_wide_screen = true;
 		}
 		break;
 	}