Fix the condition to return -ENOPNOTSUPP when i2c repeated read attempted.
Currently the error occures even if a read after write is attempted.
This is the standard way to i2c_read_reg which should be supported.
The -EOPNOTSUPP requires the previous R/W state to be reading.
This means a `I2C_SR2_TRA` must be checked to be 0.
df19d33b77