ASoC: cs35l56: Update comment on masking of EINT20 interrupts

EINT20 contains wake-source interrupts and also interface-blocked
interrupts, which all default to unmasked after reset or wake.

The comment in cs35l56_init() only mentioned the wake interrupts.
Update the comment so it's clear that it's intentional to also
mask the *_BLOCKED interrupts.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230418144309.1100721-2-rf@opensource.cirrus.com


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