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Just clean up the code a little by using the helper rather than open
coding waiting for OTP_BOOT_DONE.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210914141349.30218-2-ckeepax@opensource.cirrus.com

Signed-off-by: Mark Brown <broonie@kernel.org>