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driver:wm9705: Check and re-set dig2 config register

Tobias Kahlki requested to merge fix_wm9705_dig2 into linux-5.15.32-seco

Due to an unknown reason, the dig2 config register resets randomly. This disables the generation of pen-down interrupts. Without the interrupt, doesn't sample further touches. As a first workaround, we check the dig2 config register before exiting the sample function and re-set the config value, if it was reset.

BCS 746-001452 BCS 746-001447

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