ASoC: rt5640: Silence warning message about missing interrupt

ASoC: rt5640: Silence warning message about missing interrupt

Interrupt is optional for the RT5640 codec. Nexus 7 doesn't use interrupt,
this results in a noisy warning message that looks like a error condition.
Make interrupt explicitly optional to silence the message, use modern
IRQF_NO_AUTOEN flag and correct the reg[q]uest typo in the message.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20210802185258.1881-1-digetx@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>