src/mb/Kconfig: Fix PCI subsystem IDs

References to MAINBOARD_PCI_SUBSYSTEM_{DEVICE_ID,VENDOR_ID} were removed
in commits

 dbd3132 sb/intel/{i82801g/i/j,bd82x6x}: Make use of generic set_subsystem()
 00bb441 sb/intel/lynxpoint: Remove PCI bridge function

Change-Id: I72bba8406eea4a264e36cc9bcf467cf5cfbed379
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32107
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/sapphire/pureplatinumh61/Kconfig

@@ -32,14 +32,6 @@ config VGA_BIOS_ID
 	string
 	default "8086,0162"
 
-config MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID
-	hex
-	default 0x1007
-
-config MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID
-	hex
-	default 0x174b
-
 config DRAM_RESET_GATE_GPIO
 	int
 	default 60