Change in coreboot[master]: drivers/i2c/designware: Report I2C timings for additional bus speeds

[Werner Zeh (Code Review)]

Attention is currently required from: Furquan Shaikh, Tim Wawrzynczak, Kyösti Mälkki.
Werner Zeh has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55088 )

Change subject: drivers/i2c/designware: Report I2C timings for additional bus speeds
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Patch Set 2:

(1 comment)

File src/drivers/i2c/designware/dw_i2c.c:

https://review.coreboot.org/c/coreboot/+/55088/comment/b366e88b_f13fcc9e 
PS2, Line 834: Now check if there are more speed settings available and report them as well.
> Would it be bad to expose information about all different I2C speeds to the OS? We can skip the ones […]

The reason I took this approach is that I would like to avoid invalid values being reported. With the current patch only the timings, that a mainboard explicitly provides in addition to the used one will be reported. This means that the developer needs to be active to add these additional timings where we have a higher chance that they are valid or even were measured to assure their validity.
If we apply a generic set of timings, chances are way higher that there will bu "dummy" timings not matching the real hardware very soon.