Change in coreboot[master]: src/soc/amd/picasso: Add HDMI 2.0 disable setting

[Martin Roth (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson, Chris Wang, Patrick Huang, Felix Held.
Martin Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52545 )

Change subject: src/soc/amd/picasso: Add HDMI 2.0 disable setting
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Patch Set 11: Code-Review+2

(1 comment)

File src/soc/amd/picasso/chip.h:

https://review.coreboot.org/c/coreboot/+/52545/comment/a4192733_c985b337 
PS11, Line 179: bit0~3: disable HDMI 2.0 DDI0~3
Could we add some #defines or an enum for this just to make it easier to understand?

#define DISABLE_HDIM2_DDI_0      BIT(0)
 ...
 #define DISABLE_HDMI2_DDI_ALL    BIT(0) | BIT(1) | BIT(2) | BIT(3)

Then in devicetree we can or them together or disable everything easily.

I'm fine if that's done in a follow-on commit so you can get this in.