[S] Change in coreboot[master]: amd: Convert dptc_enable to bool

[Tim Van Patten (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Jason Nien, Matt DeVillier, Paul Menzel, Fred Reitberger, Karthik Ramasubramanian.

Tim Van Patten has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/67188 )

Change subject: amd: Convert dptc_enable to bool
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Patch Set 6:

(1 comment)

File src/mainboard/google/zork/variants/morphius/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/67188/comment/af6ff4c0_720c7073 
PS5, Line 33: true
> Why do we quote all the simple fields then!?

At least we know it's unnecessary, so we can get rid of some of the clutter going forward.

Do I need to add them to get the CR+2 or are we ok with this version?