Change in coreboot[master]: mb/google/dedede/var/drawcia: Add support to handle pen detection

[Chen Wisley (Code Review)]

Attention is currently required from: Furquan Shaikh, Martin Roth, Henry Sun, Evan Green, Justin TerAvest, Karthik Ramasubramanian.
Chen Wisley has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49469 )

Change subject: mb/google/dedede/var/drawcia: Add support to handle pen detection
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Patch Set 16:

(4 comments)

File src/mainboard/google/dedede/variants/drawcia/gpio.c:

https://review.coreboot.org/c/coreboot/+/49469/comment/b1e1be6d_cc6f364e 
PS15, Line 10: bid
> Nit: Name it as pre_board6_gpio_table

Done

https://review.coreboot.org/c/coreboot/+/49469/comment/10801b2c_4c09d0d9 
PS15, Line 17: bid_6
> Nit: Name it as board6_gpio_table

Done

https://review.coreboot.org/c/coreboot/+/49469/comment/814ed646_42e6e1e3 
PS15, Line 19: 	/* C12 : AP_PEN_DET_ODL */
> Add a comment that the "PEN_DET_ODL has an external pull-up and hence no pad termination. […]

Done

File src/mainboard/google/dedede/variants/drawcia/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/49469/comment/26a4492e_b2f49620 
PS9, Line 175: probe  TABLETMODE TABLETMODE_ENABLED
> Done

Thanks