soc/amd/picasso: Add MADT entry for GNB IOAPIC

soc/amd/picasso: Add MADT entry for GNB IOAPIC

Add the missing entry using new Kconfig symbol for IOAPIC ID. coreboot
will always enable the GNB IOAPIC.

Cq-Depend: chrome-internal:3247431, chrome-internal:3253044
BUG=b:167421913, b:166519072
TEST=Boot fully to morphius board with and without amd_iommu kernel
     parameter. Dump MADT and IVRS tables. Cross check ioapic entries
     in MADT against IVRS.
BRANCH=Zork

Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Signed-off-by: Jason Glenesk <jason.glenesk@amd.corp-partner.google.com>
Change-Id: Ic4a2e9b71dba948e8a4907e5f97131426d8a4a3e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45056
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>