thermal: Kconfig: Remove config for not used EXYNOS_THERMAL_CORE

After removing exynos_thermal_common.[c|h] files the CONFIG_EXYNOS_THERMA_CORE
is not needed anymore.
This patch removes this entry from Kconfig.
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/samsung/Kconfig

@@ -7,12 +7,3 @@ config EXYNOS_THERMAL
 	  the TMU, reports temperature and handles cooling action if defined.
 	  This driver uses the Exynos core thermal APIs and TMU configuration
 	  data from the supported SoCs.
-
-config EXYNOS_THERMAL_CORE
-	bool "Core thermal framework support for EXYNOS SOCs"
-	depends on EXYNOS_THERMAL
-	help
-	  If you say yes here you get support for EXYNOS TMU
-	  (Thermal Management Unit) common registration/unregistration
-	  functions to the core thermal layer and also to use the generic
-	  CPU cooling APIs.