disable mutex owner check

[peter-pycom]

this allows use cases like:

import _thread
import time

main_lock = _thread.allocate_lock()

def thread_function():
    print('thread_function')
    for t in range(5):
        print(t)
    print('thread_function check lock')
    if main_lock.locked():
        print('thread_function unlock')
        time.sleep(1)
        # this core dumps when CONFIG_FREERTOS_CHECK_MUTEX_GIVEN_BY_OWNER=y
        main_lock.release()

print('main')
time.sleep(1)
main_lock.acquire()
print('locked')
print('start thread')
_thread.start_new_thread(thread_function, ())
print('try to acquire')
time.sleep(5)
main_lock.acquire()
print('juhuu')

I'm fine to do it in this project. I'm still a bit doubtful whether we should do this in the general firmware ... but it's an interesting use case that isn't really covered otherwise ... maybe uasyncio ...

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