Jeff Epler c6bc9c48c9
mimxrt10xx: implement i2sout
tested on metro m7 (green prototype version) with max98357a i2s amplifier and the following test code:
```py
import board
import time
import digitalio
from audiobusio import I2SOut
from audiocore import RawSample
from microcontroller import pin
from ulab import numpy as np

n = np.array(np.sin(np.linspace(0, np.pi*2, 218, endpoint=False)) * 200, dtype=np.int16)
print(n)
r = RawSample(n, sample_rate=8000, channel_count=2)
def main():
    with digitalio.DigitalInOut(board.LED) as l:
        l.switch_to_output(True)
        value = False
        while True:
            with I2SOut(pin.GPIO_06, pin.GPIO_07, pin.GPIO_04) as i:
                time.sleep(.01)
                l.value = value = not value
                i.play(r, loop=True)
                print(i.playing)
                time.sleep(.5)
                i.stop()
                print("STOPPED")
                print(i.playing)
                time.sleep(.5)
                i.play(r, loop=True)
                print(i.playing)
                print("PLAY AGAIN")
                time.sleep(.5)
            time.sleep(1)
```

Only stereo, 16-bit, raw samples were tested; the sample rate is actually fixed
at 48kHz in the core right now. There is more to do, but the basics work.

# Conflicts:
#	ports/mimxrt10xx/Makefile
#	ports/mimxrt10xx/mpconfigport.mk
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CircuitPython
=============

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`circuitpython.org <https://circuitpython.org>`__ \| `Get CircuitPython <#get-circuitpython>`__ \|
`Documentation <#documentation>`__ \| `Contributing <#contributing>`__ \|
`Branding <#branding>`__ \| `Differences from Micropython <#differences-from-micropython>`__ \|
`Project Structure <#project-structure>`__

**CircuitPython** is a *beginner friendly*, open source version of Python for tiny, inexpensive
computers called microcontrollers.

This package contains the "stubs", or type definitions for CircuitPython.  With some advanced
editors and other tools, this information can be identify TypeErrors, AttributeErrors, and other
problems before you deploy your code to a device and can even help autocomplete your code.

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