Add and use I2C address defines for ISSI LED drivers

[fauxpark]

Description

Less magic numbers.

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).

[fauxpark]

These boards are yet to be done:

akko/5108
akko/acr87
akko/top40
chosfox/cf81
inland/kb83
inland/mk47
monsgeek/m1
monsgeek/m5
monsgeek/m6

They have rgb_matrix.driver=is31fl3733 set, but the addresses are invalid for this chip. Presumably this is some clone or conveniently compatible equivalent.
#20556 (comment)

[HorrorTroll]

These boards are yet to be done:

akko/5108
akko/acr87
akko/top40
chosfox/cf81
inland/kb83
inland/mk47
monsgeek/m1
monsgeek/m5
monsgeek/m6

They have rgb_matrix.driver=is31fl3733 set, but the addresses are invalid for this chip. Presumably this is some clone or conveniently compatible equivalent. #20556 (comment)

Strange that the I2C address seem identical to CKLED2001 / SLED173x LED driver there? Maybe those chip in some case can be compatible with IS31FL3733 code?

[fauxpark]

Comparing the datasheets, there are a lot of similarities in the register layouts 🤔

The function page is significantly changed, but it looks like the 3733 driver only writes to registers which wouldn't exist on the CKLED2001 so it should be "safe". It does write to the configuration/"software shut down" register (00h) however I think only bit 0 matters here which is the same on both. Page 2 (auto breath) is also entirely absent, and the current tuning registers appear to be a new addition.

[fauxpark]

Turns out CKLED2001 is just SNLED27351, which is what the above listed boards use as well. So this PR is ready to go, and the rest of this mess will be cleaned up in a subsequent PR.