drivers: thermal: Remove ARCH_HAS_BANDGAP dependency for samsung

As samsung thermal support is enabled only for ARCH_EXYNOS, there is no
need to select ARCH_HAS_BANDGAP from the arch-specific code. Removing this
dependency will also allow the driver to be enabled on 64-bit SoCs.

Reviewed-by: Bartlomiej Zolnierkiewicz <[e-mail]>
Reviewed-by: Lukasz Majewski <[e-mail]>
Acked-by: Lukasz Majewski <[e-mail]>
Signed-off-by: Abhilash Kesavan <[e-mail]>
Signed-off-by: Eduardo Valentin <[e-mail]>

drivers/thermal/samsung/Kconfig

···
 config EXYNOS_THERMAL
 	tristate "Exynos thermal management unit driver"
-	depends on ARCH_HAS_BANDGAP && OF
+	depends on OF
 	help
 	  If you say yes here you get support for the TMU (Thermal Management
 	  Unit) driver for SAMSUNG EXYNOS series of SoCs. This driver initialises