machine/mimxrt1062: add flash support (machine.Flash) for Teensy 4.x - #5704

go: downloading tinygo.org/x/tap v0.1.0
go: downloading tinygo.org/x/drivers v0.33.0
   code    data     bss |   flash     ram
   8624     835     584 |    9459    1419

avrdude: AVR device initialized and ready to accept instructions
avrdude: device signature = 0x1e950f (probably m328p)
avrdude: Note: flash memory has been specified, an erase cycle will be performed.
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file /tmp/tinygo593224534/main.hex for flash
         with 9459 bytes in 1 section within [0, 0x24f2]
         using 74 pages and 13 pad bytes
avrdude: writing 9459 bytes flash ...

Writing | ################################################## | 100% 1.66s

avrdude: 9459 bytes of flash written
avrdude: verifying flash memory against /tmp/tinygo593224534/main.hex

Reading | ################################################## | 100% 1.25s

avrdude: 9459 bytes of flash verified

avrdude done.  Thank you.

TAP version 13
1..8
ok 1 - digitalReadVoltage (GPIO)
ok 2 - digitalReadGround (GPIO)
ok 3 - digitalWrite (GPIO)
ok 4 - analogReadVoltage (ADC)
ok 5 - analogReadGround (ADC)
ok 6 - analogReadHalfVoltage (ADC)
ok 7 - i2cConnection (MPU6050)
ok 8 - spiTxRx (SPI)