cpufreq: boost: Remove CONFIG_CPU_FREQ_BOOST_SW Kconfig option

Commit 2fb4719b ("cpufreq / boost: Kconfig: Support for
software-managed BOOST") added the CONFIG_CPU_FREQ_BOOST_SW config.
However EXYNOS based cpufreq drivers have been removed because of
switching to cpufreq-dt driver which will set boost-attr if required.

So, let's remove this option and update cpufreq_generic_attr[].
Signed-off-by: Yue Hu <huyue2@yulong.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/Kconfig

@@ -26,10 +26,6 @@ config CPU_FREQ_GOV_COMMON
 	select IRQ_WORK
 	bool
 
-config CPU_FREQ_BOOST_SW
-	bool
-	depends on THERMAL
-
 config CPU_FREQ_STAT
 	bool "CPU frequency transition statistics"
 	help

drivers/cpufreq/freq_table.c

@@ -290,9 +290,6 @@ EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_boost_freqs);
 
 struct freq_attr *cpufreq_generic_attr[] = {
 	&cpufreq_freq_attr_scaling_available_freqs,
-#ifdef CONFIG_CPU_FREQ_BOOST_SW
-	&cpufreq_freq_attr_scaling_boost_freqs,
-#endif
 	NULL,
 };
 EXPORT_SYMBOL_GPL(cpufreq_generic_attr);