drm/i915: Initialize fbdev DRM client with callback functions

Initialize i915's fbdev client by giving an instance of struct
drm_client_funcs to drm_client_init(). Also clean up with
drm_client_release().

Doing this in i915 prevents fbdev helpers from initializing and
releasing the client internally (see drm_fb_helper_init()). No
functional change yet; the client callbacks will be filled later.

v6:
- rename client to "intel-fbdev" (Jouni)

v2:
- call drm_fb_helper_unprepare() in error handling (Jani)
- fix typo in commit message (Sam)

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Jouni Högander <[email protected]>
Acked-by: Lucas De Marchi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Jani Nikula <[email protected]>

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