nb/amd/pi/00730f01/acpi/northbridge: don't hide PCI0 root device from OS

Return 0xf from PCI0 _STA method so that bit 2 is set which indicates
that the device should be shown in the user interface. This ports commit
c259d7192806 ("soc/amd/stoney/acpi: Unhide PCI0 root device from OS")
back from Stoneyridge.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I5e724292431be7f7c2a0b6678b426831e3c19154
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74990
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/amd/pi/00730F01/acpi/northbridge.asl b/src/northbridge/amd/pi/00730F01/acpi/northbridge.asl
index eb4d4c6..d502af4 100644
--- a/src/northbridge/amd/pi/00730F01/acpi/northbridge.asl
+++ b/src/northbridge/amd/pi/00730F01/acpi/northbridge.asl
@@ -15,7 +15,7 @@
 
 Method(_STA, 0, NotSerialized)
 {
-	Return(0x0B)	/* Status is visible */
+	Return(0x0f)	/* Status is visible */
 }
 
 Method(_PRT,0, NotSerialized)