Change in coreboot[master]: mb/google/brya: Fix brya0 WWAN poweron sequencing

[Paul Menzel (Code Review)]

Attention is currently required from: Tim Wawrzynczak.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57540 )

Change subject: mb/google/brya: Fix brya0 WWAN poweron sequencing
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Patch Set 5:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/57540/comment/5da1107c_fc58d215 
PS5, Line 11: because the modem requires a ~10 seconds
            : initialization phase before it can be used
Then the 300 ms difference used by coreboot shouldn’t make a difference then for the added complexity?

File src/mainboard/google/brya/variants/baseboard/brya/gpio.c:

https://review.coreboot.org/c/coreboot/+/57540/comment/87f1b913_5010a5fc 
PS5, Line 208: /* E0 : SATAXPCIE0 ==> WWAN_PERST_L
             : 	 * NB. Driven high here so that it is sequenced after WWAN_RST_L;
             : 	 * a PERST# signal would be reset by PLRST#, but it will be explicitly
             : 	 * programmed during a power-down sequence. */
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