drm: Remove flag FBINFO_DEFAULT from fbdev emulation

The flag FBINFO_DEFAULT is 0 and has no effect, as struct fbinfo.flags
has been allocated to zero by framebuffer_alloc(). So do not set it.

Flags should signal differences from the default values. After cleaning
up all occurrences of FBINFO_DEFAULT, the token will be removed.

v2:
* fix commit message (Miguel)

Signed-off-by: Thomas Zimmermann <[e-mail]>
Acked-by: Sam Ravnborg <[e-mail]>
Cc: Patrik Jakobsson <[e-mail]>
Cc: Alex Deucher <[e-mail]>
Cc: "Christian König" <[e-mail]>
Cc: "Pan, Xinhui" <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_fbdev_dma.c

···
 	drm_fb_helper_fill_info(info, fb_helper, sizes);
 
 	info->fbops = &drm_fbdev_dma_fb_ops;
-	info->flags = FBINFO_DEFAULT;
 
 	/* screen */
 	info->flags |= FBINFO_VIRTFB; /* system memory */

drivers/gpu/drm/drm_fbdev_generic.c

···
 	drm_fb_helper_fill_info(info, fb_helper, sizes);
 
 	info->fbops = &drm_fbdev_generic_fb_ops;
-	info->flags = FBINFO_DEFAULT;
 
 	/* screen */
 	info->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST;

drivers/gpu/drm/gma500/fbdev.c

···
 	}
 
 	info->fbops = &psb_fbdev_fb_ops;
-	info->flags = FBINFO_DEFAULT;
+
 	/* Accessed stolen memory directly */
 	info->screen_base = dev_priv->vram_addr + backing->offset;
 	info->screen_size = size;

drivers/gpu/drm/radeon/radeon_fbdev.c

···
 	}
 
 	info->fbops = &radeon_fbdev_fb_ops;
-	info->flags = FBINFO_DEFAULT;
+
 	/* radeon resume is fragile and needs a vt switch to help it along */
 	info->skip_vt_switch = false;