video: endeavoru-panel: move backlight request after probe

Due to the use of the Tegra DC backlight feature by the HTC ONE X,
backlight requests MUST NOT be made during probe or earlier. This is
because it creates a loop, as the backlight is a DC child.

To mitigate this issue, backlight requests can be made later, once the
backlight is actively used.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
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