[coreboot-gerrit] Change in coreboot[master]: drivers/i2c/generic: Add support for i2c device detection

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Raul Rangel, Matt DeVillier, Karthik Ramasubramanian.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63211 )

Change subject: drivers/i2c/generic: Add support for i2c device detection
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Patch Set 4:

(1 comment)

File src/drivers/i2c/generic/generic.c:

https://review.coreboot.org/c/coreboot/+/63211/comment/668e1d63_39c66fda 
PS4, Line 70: struct device *const busdev = i2c_busdev(dev);
            : 		if (busdev && busdev->ops->ops_i2c_bus->detect) {
            : 			if (!busdev->ops->ops_i2c_bus->detect(busdev,
            : 					dev->path.i2c.device)) {
            : 				printk(BIOS_SPEW, "%s: %s at %s -- NOT FOUND, skipping\n", path,
            : 					config->desc ? : dev->chip_ops->name, dev_path(dev));
            : 				return;
            : 			}
            : 		}
Looking at it now, it's not much more code at the client site to use the 0-byte write, e.g.:

```
struct device *const busdev = i2c_busdev(dev);
if (busdev) {
    struct i2c_msg seg = { .slave = dev->path.i2c.device };
    if (busdev->ops->ops_i2c_bus->transfer(busdev, &seg, 1)) {
    	printk(BIOS_SPEW, "%s: %s at %s -- NOT FOUND, skipping\n", path,
    		config->desc ? : dev->chip_ops->name, dev_path(dev));
    	return;
    }
}
```