drivers: i2c_stm32_v2: Rework interrupt handler

- Rework transaction flow  to better match reference manual
and errata sheet for STM32 I2Cv2 peripheral
- Handle message transactions larger than 255 bytes in isr
- Combine stm32_i2c_msg_write and stm32_i2c_msg_read into
one common function stm32_i2c_irq_xfer when using interrupts

Signed-off-by: Erik Andersson <[email protected]>

Author: erian747

drivers/i2c/i2c_ll_stm32.h

@@ -110,6 +110,7 @@ struct i2c_stm32_data {
 		unsigned int is_arlo;
 		unsigned int is_nack;
 		unsigned int is_err;
+		bool continue_in_next;
 		struct i2c_msg *msg;
 		unsigned int len;
 		uint8_t *buf;