i2c: Add work-around to make i2c scan work

The I2C HW cannot support 0-byte transfer as I2C scan requests. Send one dummy
byte for I2C scan to make it work.

Signed-off-by: Dong Wang <dong.d.wang@intel.com>

Author: kwd-doodling

bsp_sedi/drivers/i2c/sedi_i2c_dw_apb_200a.c

@@ -878,7 +878,6 @@ int32_t sedi_i2c_master_write_async(IN sedi_i2c_t i2c_device, IN uint32_t addr,
 	DBG_CHECK(i2c_device < SEDI_I2C_NUM, SEDI_DRIVER_ERROR_PARAMETER);
 	DBG_CHECK(0 != (addr & SEDI_RBFM(I2C, TAR, IC_TAR)), SEDI_DRIVER_ERROR_PARAMETER);
 	DBG_CHECK(NULL != data, SEDI_DRIVER_ERROR_PARAMETER);
-	DBG_CHECK(0 != num, SEDI_DRIVER_ERROR_PARAMETER);
 
 	struct i2c_context *context = &contexts[i2c_device];
 
@@ -909,7 +908,12 @@ int32_t sedi_i2c_master_write_async(IN sedi_i2c_t i2c_device, IN uint32_t addr,
 	context->status.event = SEDI_I2C_EVENT_TRANSFER_NONE;
 
 	context->buf = (uint8_t *)data;
-	context->buf_size = num;
+	if ((num == 0) && (data != NULL)) {
+		/* Workaround for I2C scanner as HW does not support 0 byte transfers. */
+		context->buf_size = 1;
+	} else {
+		context->buf_size = num;
+	}
 	context->rx_cmd_index = 0;
 	context->buf_index = 0;
 	context->pending = pending;