drm/mgag200: Extract device type from flags

Adds a conversion function that extracts the device type from the
PCI id-table flags. Allows for storing additional information in the
other flag bits.

Signed-off-by: Thomas Zimmermann <[email protected]>
Fixes: 81da87f63a1e ("drm: Replace drm_gem_vram_push_to_system() with kunmap + unpin")
Reviewed-by: Daniel Vetter <[email protected]>
Cc: John Donnelly <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Emil Velikov <[email protected]>
Cc: "Y.C. Chen" <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: "José Roberto de Souza" <[email protected]>
Cc: Andrzej Pietrasiewicz <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # v5.3+
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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