esp8266/machine_pin: Disable ets_loop_iter during hard IRQ handler.
esp8266/machine_pin: Disable ets_loop_iter during hard IRQ handler.

Otherwise ets_loop_iter may be reentered.  Related to issue #5714.

pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython