ports: zephyr: Add support for BeagleConnect Freedom.

[Ayush1325]

• Add build CI.
• Add the following capabilities
  • I2C
  • SPI
  • FLASH
• Cherry picked from zephyr: Track mainline zephyr #15891

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.57%. Comparing base (ca6723b) to head (5c52bf6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #15959   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files         164      164           
  Lines       21336    21336           
=======================================
  Hits        21031    21031           
  Misses        305      305           

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[github-actions]

Code size report:

   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64:    +0 +0.000% standard
      stm32:    +0 +0.000% PYBV10
     mimxrt:    +0 +0.000% TEENSY40
        rp2:    +0 +0.000% RPI_PICO_W
       samd:    +0 +0.000% ADAFRUIT_ITSYBITSY_M4_EXPRESS
  qemu rv32:    +0 +0.000% VIRT_RV32