power: supply: max17042_battery: Honor MAX17055 charge voltage

MAX17055 ModelCfg.VChg selects the charge-voltage range used by EZ Config.
Consume voltage-max-design-microvolt from monitored-battery and set VChg
only when the value is strictly greater than 4.275 V. Reject an explicit
zero voltage and preserve the register when the property is absent.

Update only the VChg bit and verify its read-back so unrelated ModelCfg
fields remain intact. Treat a VChg-only override as an accumulator change:
read effective DesignCap and dQAcc, derive and verify the matching dPAcc,
then request model refresh. This keeps voltage-only firmware descriptions
coherent with the selected charge-voltage range.

Assisted-by: OpenCode:gpt-5.6-sol
Signed-off-by: Vincent Cloutier <vincent@cloutier.co>
Link: https://patch.msgid.link/20260727011319.621794-11-vincent.cloutier@icloud.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

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