tegra: video: Don't power up the SOR twice
If U-Boot is the secondary boot loader, or has been run from itself, the SOR may already be powered up. Powering it up again causes a hang, so detect this situation and skip it. Signed-off-by: NSimon Glass <sjg@chromium.org> Acked-by: NAnatolij Gustschin <agust@denx.de>
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