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Moved USB PHY source and headers from `usb/` to `esp_hw_support/` to better reflect their hardware-specific nature. Replaced use of public GPIO driver APIs with internal LL (Low-Level) APIs for more precise hardware control and alignment with ESP-IDF HAL best practices. Deleted deprecated PHY helper functions. Consolidated all SoC-specific declarations under `usb_periph.h`. BREAKING CHANGE: deprecated USB PHY APIs have been removed; update callers to use the new interfaces in esp_hw_support/usb_phy.h