IS31FL3729 updates

[fauxpark]

Description

Followup to #21850, bringing the driver up to par with the others.

• Adjusted spread spectrum define names
• Removed PWM register offset (LED drivers: remove PWM register offsets #22897)
• Stored I2C addresses in an array (LED drivers: place I2C addresses into an array #22975)
• Added pullup/down resistor defines & config
• Added SDB pin support (LED drivers: add support for shutdown pin #23058)

@HorrorTroll, would appreciate some testing :)

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).