[coreboot] Patch merged into coreboot/master: 68daf3a pci.h: Drop unused `mainboard_pci_subsystem*` prototypes

the following patch was just integrated into master:
commit 68daf3a8757cabb4154c8e2e9712059bab603c3f
Author: Patrick Georgi 
Date:   Sat Mar 9 13:24:43 2013 +0100

pci.h: Drop unused `mainboard_pci_subsystem*` prototypes

We used to allow mainboards to override subsystems using
    mainboard_pci_subsystem_vendor_id and mainboard_pci_subsystem_device_id.

Mechanisms have changed and the only occurrence of these names is in
    the header.

Change-Id: Ic2ab13201a2740c98868fdf580140b7758b62263
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/2625
    Reviewed-by: Paul Menzel 
    Tested-by: build bot (Jenkins)

See http://review.coreboot.org/2625 for details.

-gerrit