[CPUFREQ] X86_GX_SUSPMOD must depend on PCI

This patch fixes the following compile error:

...
  CC      arch/i386/kernel/cpu/cpufreq/gx-suspmod.o
arch/i386/kernel/cpu/cpufreq/gx-suspmod.c: In function 'gx_detect_chipset':
arch/i386/kernel/cpu/cpufreq/gx-suspmod.c:193: error: implicit declaration of function 'pci_match_id'
arch/i386/kernel/cpu/cpufreq/gx-suspmod.c:193: warning: comparison between pointer and integer
make[3]: *** [arch/i386/kernel/cpu/cpufreq/gx-suspmod.o] Error 1

<--  snip  -->

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave Jones <davej@redhat.com>

arch/i386/kernel/cpu/cpufreq/Kconfig

@@ -96,6 +96,7 @@ config X86_POWERNOW_K8_ACPI
 
 config X86_GX_SUSPMOD
 	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
+	depends on PCI
 	help
 	 This add the CPUFreq driver for NatSemi Geode processors which
 	 support suspend modulation.