scripts: sd_fusing: Check the minimum required Python version

scripts: sd_fusing: Check the minimum required Python version

"extend" of action was added since python3.8.
If python version is lower than 3.8, it will be occurred the error like below.

Traceback (most recent call last):
  File "./scripts/tizen/sd_fusing.py", line 1375, in <module>
    help="binary to flash, may be used multiple times")
  File "/usr/local/lib/python3.7/argparse.py", line 1358, in add_argument
    raise ValueError('unknown action "%s"' % (action_class,))
ValueError: unknown action "extend"

Refer to Python Doc:
3.7 - https://docs.python.org/3.7/library/argparse.html#action
3.8 - https://docs.python.org/3.8/library/argparse.html#action

Change-Id: I8d9deafcddbe67f80adc310d01f22891a2d802ae
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>