extmod/btstack: Enable SYNC_EVENTS, PAIRING_BONDING by default.
extmod/btstack: Enable SYNC_EVENTS, PAIRING_BONDING by default.

Synchronous events work on stm32 and unix ports.

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

adafruit/circuitpython,bvernoux/micropython,bvernoux/micropython,henriknelson/micropython,henriknelson/micropython,henriknelson/micropython,henriknelson/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,henriknelson/micropython,bvernoux/micropython,bvernoux/micropython