ENGR00275429 Recovery: Screen flashing found when wipe data in recovery mode

Android Recovery UI framework uses FBIOPUT_VSCREENINFO with yoffset update
to update display.
Both elcdif and ipuv3 FB will set var.activate to be FB_ACTIVATE_FORCE in
driver's probe. User space will get the VSCREENINFO with activate been set
to FB_ACTIVE_FORCE. Each FBIOPUT_VSCREENINFO with only yoffset update will
make the driver reinit.The activate should be cleared once set_par() been
finished.
HDMI driver should only reinit hdmi only when the mode changed. fbmem will
broadcast MODE_CHANGE for each FBIOPUT_VSCREENINFO ioctl even it only have
yoffset update.

Signed-off-by: guoyin.chen <guoyin.chen@freescale.com>

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