adc: ad405x: Fix AD4052 Production ID and Data format reset value.

[gastmaier]

Pull Request Description

According to the ad4052 datasheet

PRODUCT_ID_L.PRODUCT_ID        value is 0x72                          (p. 54)
ADC_MODES.DATA_FORMAT    reset value is 0x01 Twos Complement (Signed) (p. 58)

For the data_fomat, the ad405x iio driver on pcf always write this register on init, so this mistake only affects users leveraging the no-OS driver directly. The first should affect all.

PR Type

• [X] Bug fix (change that fixes an issue)
• [ ] New feature (change that adds new functionality)
• [ ] Breaking change (has dependencies in other repos or will cause CI to fail)

PR Checklist

• [ ] I have followed the Coding style guidelines
• [ ] I have performed a self-review of the changes
• [ ] I have commented my code, at least hard-to-understand parts
• [ ] I have build all projects affected by the changes in this PR
• [ ] I have tested in hardware affected projects, at the relevant boards
• [ ] I have signed off all commits from this PR
• [ ] I have updated the documentation (wiki pages, ReadMe etc), if applies