ENGR00144112 TVE:Fix potential hang issue for suspend

Framebuffer suspend event comes before framebuffer
blank event when system entering suspend mode.
So, if another driver calls FB_EVENT_BLANK
notifier chain, i.e, Android IPUv3 fb driver,
the suspend and blank event handlers registered
in TVE driver will be called. We used to disable
TVE clock in suspend handler, so it causes system
hang when we try to access TVE register when go
to blank handler. This patch fixes this issue.

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>

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