[PATCH RESEND 2/3] drm: adv7511: mark ADV7511_REG_EDID_READ_CTRL volatile

[Wolfram Sang]

> A small note though, even though the patch is correct, it will be of limited 
> use as the EDID_READ_CTRL register is never accessed by the driver.

It was useful to me when debugging and looking at the register set in
debugfs.

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