fix(usp-main-2025): fix LR_FHSS_SRC_PATH for flattened lr_fhss_driver layout

[Mikefly123]

What

Fixes LR_FHSS_SRC_PATH in modules/usp_drivers/dev_env.cmake to no longer append a now-nonexistent lr_fhss_driver/src subdirectory suffix.

Why

Upstream usp (main-2025) removed the lr_fhss_driver/src/ subdirectory; lr_fhss_mac.c now lives flat in sx126x_driver/src, the same directory as LBM_SX126X_LIB_DIR. With the old suffix the cmake path pointed at a directory that no longer exists, breaking the build against current upstream usp.

Validation

• HWIL-proven as carried patch; validated as part of proves-core-reference PR #439: feat: UHF radio port to Semtech USP — v5e board, UspRadio integration, carried patches (central tracking PR) proves-core-reference#439

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Review details

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: dea987b6-8b41-43de-843a-4142af7402a7

📥 Commits

Reviewing files that changed from the base of the PR and between bfacd43 and fe4a28c.

📒 Files selected for processing (6)

• drivers/usp/Kconfig
• drivers/usp/sx126x/sx126x_board.c
• drivers/usp/sx126x/sx126x_hal.c
• drivers/usp/sx126x/sx126x_hal_context.h
• dts/bindings/usp/semtech,sx126x-new-common.yaml
• modules/usp_drivers/dev_env.cmake

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[Mikefly123]

Stack position 3/6 of stack Lora-net#8: base #2. Next: #4.