drivers: i2c: i2c_max32: Respect message flags in DMA mode

Send STOP or RESTART after a message only if they are enabled in message
flags. For reads, however, controller sends a NACK after last byte so a
restart is required even if I2C_MSG_RESTART flag is not set.

Signed-off-by: Tahsin Mutlugun <Tahsin.Mutlugun@analog.com>