ASoC: codecs: aw88261: Fix erroneous bitmask logic in Awinic init

[ Upstream commit b82fa9b0c26eeb2fde6017f7de2c3c544484efef ]

The aw88261_dev_reg_update() function sets the Awinic registers in a
rather nonuniform way:
  - most registers get directly overwritten from the firmware blob
  - but a handful of them need more delicate logic to preserve
    some bits from their current value, according to a register-
    specific mask
For the latter, the logic is basically
       NEW = (OLD & MASK) | (VAL & ~MASK)
However, the ~MASK value is hand-computed, and in the specific case
of the SYSCTRL register, in a buggy way.
This patch restores the proper ~MASK value.

Fixes: 028a2ae25691 ("ASoC: codecs: Add aw88261 amplifier driver")
Signed-off-by: Alexandre Ferrieux <alexandre.ferrieux@orange.com>
Link: https://patch.msgid.link/20260211-aw88261-fwname-v1-1-e24e833a019d@fairphone.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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