VID6608: add hardware RMT support for Automotive gauge driver

[petrows]

Description:

Hey Folks, i would like to introduce my weekend project.

This PR updates the xdr-92 (the Automotive gauge stepper driver) for vid6608 chipset: add hardware acceleration for gauge drive using the ESP-32 Remote Control Transceiver (RMT). Feature can be enabled with the new VID6608_RMT config option, default is false.

Now driver has 3 modes:

• Software, single-thread (ESP8266 only), using the old arduino-vid6608 library; Very slow, but works everywhere.
• Software, multi-thread (ESP32 default), using the old arduino-vid6608 library with FreeRTOS task; Moderate, works good on dual-core chips, works with issues on single-core chips (tested on ESP32C6).
• Hardware (ESP32 RMT) using the new esp-32-vid6608-rmt library; Best performance, but requires free RMT available.

RMT driver notes

RMT driver gives really smooth movement, no glitches, even on weak chips. No delay() function calls and minimum load on SoC.

Full video: https://youtu.be/dASliRoJWo4

Looks like it conflicts with WS2812b driver with default configuration (and likely other drivers) on weak platforms with reduced feature set, so RMT is disabled by default and requires explicit config option.

Acceleration curve is much more complex to implement for RMT driver, this implementation has very small one (compare to software variant), i will try to improve it in the future.

Documentation update: tasmota/docs#1556

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.3.8 from Platform 2026.05.50
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[petrows]

During work on this patch i have found another issue: #24760 ; currently it is not possible to switch (via user-config-h) the WS2812b driver to non-RMT mode, which is used by default.

[s-hadinger]

This looks good to me. @arendst ok for merging?