drivers: power: lt3074: add driver for LT3074

[cencarna]

Pull Request Description

The LT3074 is a low voltage, ultralow noise, and ultrafast transient
response linear regulator with a PMBus serial interface. The device
supplies up to 3A with a typical dropout voltage of 45mV.

This pull request adds the no-OS and IIO driver, as well as examples
and documentations, to quickly evaluate the LT3074.

PR Type

• 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

[cencarna]

v2:

• Removed pointer casts. Used intermediate variables instead to handle type differences.

[buha]

Please also update the project to the new project infrastructure.

Here's the PR with the changes with 3 modified projects as example: #2412

And here's a pending PR where I gave feedback with pretty much that needs to be changed, same applies to your PR.
#2411