DDC: send VCP writes twice#362
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Do not stop after the first successful I2C write; MonitorControl's Arm64 DDC path also runs the configured write cycles.
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As done in MonitorControl; send VCP writes twice such that they stick.
Verified against a Dell U4021QW via a standalone IOAVService harness: one write leaves VCP 0x62 unchanged; two writes change it as expected.
Developed with Claude 4.8