cpufreq: s3c24xx: fix "depends on ARM_S3C24XX" in Kconfig

Kconfig symbol S3C24XX_PLL depends on ARM_S3C24XX.  But that symbol
doesn't exist.  Commit f023f8dd59bf ("cpufreq: s3c24xx: move cpufreq
driver to drivers/cpufreq"), which added this issue, makes it clear
that ARM_S3C24XX_CPUFREQ was intended here.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/arm/mach-s3c24xx/Kconfig

@@ -208,7 +208,7 @@ config S3C24XX_GPIO_EXTRA128
 
 config S3C24XX_PLL
 	bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
-	depends on ARM_S3C24XX
+	depends on ARM_S3C24XX_CPUFREQ
 	help
 	  Compile in support for changing the PLL frequency from the
 	  S3C24XX series CPUfreq driver. The PLL takes time to settle