video: sunxi: disp: fix screen wakeup when using earlysuspend

Commit 1ede6cfd2b ("sunxi-disp: Unify early and normal suspend paths")
causes BSP_disp_*_[close|open] to be called twice when earlysuspend is
in use. This commit skips those calls on the normal suspend path used
when earlysuspend is enabled.

Signed-off-by: Emilio López <turl@linux-sunxi.org>