AEDROXH7: fix LED strip DMA conflict with motor outputs

[sensei-hacker]

dmavar=0 maps to DMA1 Stream 0, which is already claimed by M1 (TIM8_CH2). When DSHOT is active, the LED strip silently fails to initialize because its DMA stream is already owned. Change to dmavar=8 (DMA2 Stream 0), matching the pattern used by other H7 targets (MATEKH743, MAMBAH743, etc.).

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[sensei-hacker]

Duplicate of #11629

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[github-actions]

Test firmware build ready — commit 511a3cf

Download firmware for PR #11630

1 targets built. Find your board's .hex file by name on that page (e.g. MATEKF405SE.hex). Files are individually downloadable — no GitHub login required.

Development build for testing only. Use Full Chip Erase when flashing.