mb/amd/padmelon/bootblock/OemCustomize: add TODO for Prairie Falcon

The PCIe port descriptor list seems to be specific to Merlin Falcon and
Prairie Falcon has a different PCIe root port configuration. Since I
neither have the board nor the different APUs, I just add a comment
about this instead of trying to come up with a PCIe port descriptor list
that may or may not work properly on Prairie Falcon APUs.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I8e1eb67a8f684297bbefc6e2593250d7bd45593f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68407
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

src/mainboard/amd/padmelon/bootblock/OemCustomize.c

@@ -2,6 +2,12 @@
 
 #include <amdblocks/agesawrapper.h>
 
+/*
+ * TODO:
+ * Check if a separate PCIe port list is needed for Prairie Falcon APUs. Only Merlin Falcon has
+ * PCIe root ports on the functions of bus 0 device 3.
+ */
+
 static const PCIe_PORT_DESCRIPTOR PortList[] = {
 	/*
 	 * Init Port descriptor (PCIe port, Lanes 8-15,