x86: L3 cache index disable for 2.6.26, fix #2

fix !PCI build failure:

 arch/x86/kernel/cpu/intel_cacheinfo.c: In function 'get_k8_northbridge':
 arch/x86/kernel/cpu/intel_cacheinfo.c:675: error: implicit declaration of function 'pci_match_id'

Signed-off-by: Ingo Molnar <mingo@elte.hu>