touch_pad_set_measurement_clock_cycles() function

- ESP_OK Set the clock cycle success

This function will specify the clock cycles of each measurement and the clock is sourced from SOC_MOD_CLK_RTC_FAST, its default frequency is SOC_CLK_RC_FAST_FREQ_APPROX The touch sensor will record the charge and discharge times during these clock cycles as the final result (raw value) If clock cycles is too small, it may lead to inaccurate results.