ESP32: move adc runtime reading functions to IRAM. #491
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The intention of these changes are to improve the ADC reading execution speed, so we address it by moving all runtime ADC functions for ESP32 platform to the IRAM, since this memory is core-coupled regardless the ESP32 family there is no cache miss possibility and the latency is the lowest possible, it can save some precious microseconds.
Also this change prevents any crash to occur if the ESP32 chip to disable the ICACHE temporary, very likely to happen on dual-core chip variant like, ESP32, S3 and P4.