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When MICROPY_PY_MACHINE_I2C_TRANSFER_WRITE1 is enabled the port's hardware
I2C transfer functions should support the MP_MACHINE_I2C_FLAG_WRITE1
option, but software I2C will not.  So add a flag to the I2C protocol
struct so each individual protocol can indicate whether it supports this
option or not.

Fixes issue #8765.
Signed-off-by: Damien George <damien@micropython.org>