Change in coreboot[master]: amdfam_10h-15h: Use ENV_PCI_SIMPLE_DEVICE

[Kyösti Mälkki (Code Review)]

Kyösti Mälkki has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/35654 )

Change subject: amdfam_10h-15h: Use ENV_PCI_SIMPLE_DEVICE
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Patch Set 2:

This is mostly for consistency and to remove __SIMPLE_DEVICE__ strings from my grep results.