drm/i915/dsi: Replace while(1) with one with clear exit condition

Move existing condition to while(), so it will be clear on what
circumstances the loop is successfully finishing.

Reviewed-by: Andi Shyti <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Tested-by: Hans de Goede <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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