thermal: delete "default y"

The generic thermal I/F gets selected by ACPI_THERMAL --
its only current customer.
it doesn't need to clutter other configs by default.

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 69f19f2..17e71d5 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -4,7 +4,6 @@
 
 menuconfig THERMAL
 	bool "Generic Thermal sysfs driver"
-	default y
 	help
 	  Generic Thermal Sysfs driver offers a generic mechanism for
 	  thermal management. Usually it's made up of one or more thermal