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J. Nick Koston
6cb131ce54
Replace the poll-based busy-wait introduced in #15662 with a call to Arduino's 1-arg esp_delay(), which uses os_timer + esp_suspend to properly suspend the cont task for the requested duration. The busy-wait only yielded via optimistic_yield(1000) once 1 ms had elapsed since the last task switch, so short waits like delay(1) often finished without ever yielding. That starved the SDK and extended interrupt latency, breaking timing sensitive interrupt-driven code such as the ESP8266 software-serial RX path used by fingerprint_grow. esp_delay()'s 1-arg form does not itself call millis(), so the slow Arduino millis() body is not pulled into IRAM by this path; the --wrap=millis goal of #15662 is preserved. Fixes #16558
