drm/fb-helper: Call dirty helper after writing to fbdev

If fbdev uses a shadow framebuffer, call the damage handler. Otherwise
the update might not make it to the screen.

v2:
	* mark virtual screen as dirty (Ville)

Signed-off-by: Thomas Zimmermann <[email protected]>
Fixes: 222ec45f4c69 ("drm/fb_helper: Support framebuffers in I/O memory")
Acked-by: Maxime Ripard <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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