roccat: replace various msleep with actual device wait for readiness
roccat: replace various msleep with actual device wait for readiness

The device can tell whether it is ready or not, so better poll for it
instead of waiting 100ms and hoping for the best.

Signed-off-by: Benjamin Tissoires <7a0e50e3f6a0939db82b6a8a423c08a163896f41@gmail.com>

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