Change in coreboot[master]: mb/google/cherry: Add DRAM calibration support

[Hung-Te Lin (Code Review)]

Attention is currently required from: Rex-BC Chen, Yu-Ping Wu.
Hung-Te Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/54269 )

Change subject: mb/google/cherry: Add DRAM calibration support
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Patch Set 9:

(1 comment)

File src/mainboard/google/cherry/sdram_configs.c:

https://review.coreboot.org/c/coreboot/+/54269/comment/2ce7460b_95f746c0 
PS4, Line 8: Currently ddr_geometry and ddr_type are not used in Cherry.
> We can get all information after dram-k. […]

Depthcharge can help creating the device tree, although we still need a way to pass the information from Coreboot to Depthcharge.

+jwerner@ who is already planning for something related  (https://lore.kernel.org/patchwork/patch/1401359/) - maybe we should move the discussion to an issue. Let me create that.