[Keymap] Updates to personal Drop ALT keymap

[ewersp]

Description

This PR contains small updates to my personal keymap for the Drop ALT keyboard. Primarily the changes are to enable EEPROM persistence for the RGB mode, to avoid having to reset the RGB pattern every time the board loses power.

It's worth noting that EEPROM is still disabled by default for the Drop ALT, so for this to actually work changes are also needed from #6068 which is unfortunately stuck in limbo.

I'd still like to get these keymap changes into mainline though, as they compile and run fine on their own.

Types of Changes

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

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).

[drashna]

Just a heads up, the massdrop boards don't officially support eeprom.

[ewersp]

Just a heads up, the massdrop boards don't officially support eeprom.

Yeah :( I grabbed the updated mdloader from Massdrop/mdloader#49 and modified qmk_firmware\tmk_core\common\arm_atsam\eeprom.c locally to make everything work, but it seems fine (and harmless?)

[ewersp]

I just realized some RGB-related changes were made to the default drop alt keymap, so I incorporated those changes into this PR (and removed a legacy hack I had to address the flickering caps lock key which has now been fixed properly).

[stale]

Thank you for your contribution!
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[drashna]

Thanks!