cpufreq: sfi-cpufreq: Remove driver for deprecated firmware

SFI-based platforms are gone. So does this driver.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/Kconfig.x86

@@ -62,16 +62,6 @@ config X86_ACPI_CPUFREQ_CPB
 	  By enabling this option the acpi_cpufreq driver provides the old
 	  entry in addition to the new boost ones, for compatibility reasons.
 
-config X86_SFI_CPUFREQ
-	tristate "SFI Performance-States driver"
-	depends on X86_INTEL_MID && SFI
-	help
-	  This adds a CPUFreq driver for some Silvermont based Intel Atom
-	  architectures like Z34xx and Z35xx which enumerate processor
-	  performance states through SFI.
-
-	  If in doubt, say N.
-
 config ELAN_CPUFREQ
 	tristate "AMD Elan SC400 and SC410"
 	depends on MELAN

drivers/cpufreq/Makefile

@@ -43,7 +43,6 @@ obj-$(CONFIG_X86_P4_CLOCKMOD)		+= p4-clockmod.o
 obj-$(CONFIG_X86_CPUFREQ_NFORCE2)	+= cpufreq-nforce2.o
 obj-$(CONFIG_X86_INTEL_PSTATE)		+= intel_pstate.o
 obj-$(CONFIG_X86_AMD_FREQ_SENSITIVITY)	+= amd_freq_sensitivity.o
-obj-$(CONFIG_X86_SFI_CPUFREQ)		+= sfi-cpufreq.o
 
 ##################################################################################
 # ARM SoC drivers