thermal: exynos: Remove un-necessary CPU_THERMAL dependency

This patch removes the dependency on CPU_THERMAL for compiling TMU driver.
This is useful for cases when only TMU controller needs to be initialised
without cpu cooling action.
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Acked-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Acked-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>

drivers/thermal/samsung/Kconfig

 config EXYNOS_THERMAL
 	tristate "Temperature sensor on Samsung EXYNOS"
 	depends on ARCH_HAS_BANDGAP
-	depends on CPU_THERMAL
 	help
 	  If you say yes here you get support for TMU (Thermal Management
 	  Unit) on SAMSUNG EXYNOS series of SoC. This helps in registering