drm/mgag200: Remove declaration of mgag200_mmap() from header file

Commit 94668ac796a5 ("drm/mgag200: Convert mgag200 driver to VRAM MM")
removed the implementation of mgag200_mmap(). Also remove the declaration.

Signed-off-by: Thomas Zimmermann <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Fixes: 94668ac796a5 ("drm/mgag200: Convert mgag200 driver to VRAM MM")
Cc: Gerd Hoffmann <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: "Noralf Trønnes" <[email protected]>
Cc: Armijn Hemel <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Emil Velikov <[email protected]>
Cc: <[email protected]> # v5.3+
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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