timekeeping: Switch HAS_PERSISTENT_CLOCK to ALWAYS_USE_PERSISTENT_CLOCK

Jason pointed out the HAS_PERSISTENT_CLOCK name isn't
quite accurate for the config, as some systems may have
the persistent_clock in some cases, but not always.

So change the config name to the more clear
ALWAYS_USE_PERSISTENT_CLOCK.
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>

arch/x86/Kconfig

@@ -108,7 +108,7 @@ config X86
 	select GENERIC_STRNLEN_USER
 	select HAVE_RCU_USER_QS if X86_64
 	select HAVE_IRQ_TIME_ACCOUNTING
-	select HAS_PERSISTENT_CLOCK
+	select ALWAYS_USE_PERSISTENT_CLOCK
 	select GENERIC_KERNEL_THREAD
 	select GENERIC_KERNEL_EXECVE
 	select MODULES_USE_ELF_REL if X86_32

drivers/rtc/Kconfig

@@ -20,7 +20,7 @@ if RTC_CLASS
 config RTC_HCTOSYS
 	bool "Set system time from RTC on startup and resume"
 	default y
-	depends on !HAS_PERSISTENT_CLOCK
+	depends on !ALWAYS_USE_PERSISTENT_CLOCK
 	help
 	  If you say yes here, the system time (wall clock) will be set using
 	  the value read from a specified RTC device. This is useful to avoid
@@ -29,7 +29,7 @@ config RTC_HCTOSYS
 config RTC_SYSTOHC
 	bool "Set the RTC time based on NTP synchronization"
 	default y
-	depends on !HAS_PERSISTENT_CLOCK
+	depends on !ALWAYS_USE_PERSISTENT_CLOCK
 	help
 	  If you say yes here, the system time (wall clock) will be stored
 	  in the RTC specified by RTC_HCTOSYS_DEVICE approximately every 11

include/linux/time.h

@@ -117,7 +117,7 @@ static inline bool timespec_valid_strict(const struct timespec *ts)
 
 extern bool persistent_clock_exist;
 
-#ifdef CONFIG_HAS_PERSISTENT_CLOCK
+#ifdef ALWAYS_USE_PERSISTENT_CLOCK
 #define has_persistent_clock()	true
 #else
 static inline bool has_persistent_clock(void)

kernel/time/Kconfig

@@ -13,7 +13,7 @@ config ARCH_CLOCKSOURCE_DATA
 	bool
 
 # Platforms has a persistent clock
-config HAS_PERSISTENT_CLOCK
+config ALWAYS_USE_PERSISTENT_CLOCK
 	bool
 	default n