revert boot.py to fona-support version

Author: ericskiff

boot.py

@@ -4,7 +4,6 @@
 import digitalio
 import storage
 import adafruit_ahtx0
-import rtc
 
 led = digitalio.DigitalInOut(board.LED)
 led.direction = digitalio.Direction.OUTPUT
@@ -18,10 +17,6 @@
 reset_pin.direction = digitalio.Direction.INPUT
 #####################
 
-## Set up the realtime clock
-r = rtc.RTC()
-print(f"Time at start: {r.datetime}")
-
 try:
     i2c = board.I2C()  # uses board.SCL and board.SDA
     sensor = adafruit_ahtx0.AHTx0(i2c)