[CPUFREQ] Kconfig powernow-k8 driver should depend on ACPI P-States driver

powernow-k8 really needs to use ACPI to function on SMP systems.
The current Kconfig allows us to build kernels which fail mysteriously
for some users due to us trying to automatically enable this, and
getting it wrong.  It's easier to just present this as an option
to the user.
Signed-off-by: Joshua Hoblitt <jhoblitt@ifa.hawaii.edu>
Signed-off-by: Dave Jones <davej@redhat.com>

arch/i386/kernel/cpu/cpufreq/Kconfig

@@ -90,10 +90,17 @@ config X86_POWERNOW_K8
 	  If in doubt, say N.
 
 config X86_POWERNOW_K8_ACPI
-	bool
-	depends on X86_POWERNOW_K8 && ACPI_PROCESSOR
-	depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
+	bool "ACPI Support"
+	select ACPI_PROCESSOR
+	depends on X86_POWERNOW_K8
 	default y
+	help
+	  This provides access to the K8s Processor Performance States via ACPI.
+	  This driver is probably required for CPUFreq to work with multi-socket and
+	  SMP systems.  It is not required on at least some single-socket yet
+	  multi-core systems, even if SMP is enabled.
+
+	  It is safe to say Y here.
 
 config X86_GX_SUSPMOD
 	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"