soc/amd/phoenix/chipset_*.cb: remove TODO

Remove the TODO to update the chipset devicetree for Phoenix, since this
has already been done.

When re-checking the chipset devicetree, I found conflicting information
about the existence of the PCI bridge to an external PCIe port on bus 0
device 1 function 5, but after looking into this, I'm reasonably certain
that it either doesn't exist or at least wouldn't be usable, so I won't
add that one to the chipset devicetree.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I8f0e1540ed45408e86186253d3982a7ba0065ac6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82578
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-by: Varshit Pandya <pandyavarshit@gmail.com>

src/soc/amd/phoenix/chipset_fsp.cb

@@ -1,5 +1,3 @@
-# TODO: Update for Phoenix
-
 chip soc/amd/phoenix
 	device cpu_cluster 0 on
 		ops amd_cpu_bus_ops

src/soc/amd/phoenix/chipset_opensil.cb

@@ -1,5 +1,3 @@
-# TODO: Update for Phoenix
-
 chip soc/amd/phoenix
 	device cpu_cluster 0 on
 		ops amd_cpu_bus_ops