drm/tegra: Stop using drm_framebuffer_unregister_private

This is the deprecated function for when you embedded the framebuffer
somewhere else (which breaks refcounting). But Tegra is using
drm_framebuffer_remove and a free-standing FB, so this is redundant.

One caveat here is that the failure path in the init code still
manually cleaned up the fb. I presume that was an oversight and
changed it over to drm_framebuffer_remove too.

Cc: Thierry Reding <[email protected]>
Reviewed-by: Archit Taneja <[email protected]>
Acked-by: Thierry Reding <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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