When the thermal subsystem is a loadable module, the spear driver
fails to build:

drivers/thermal/built-in.o: In function `spear_thermal_exit':
spear_thermal.c:(.text+0xf8): undefined reference to 
`thermal_zone_device_unregister'
drivers/thermal/built-in.o: In function `spear_thermal_probe':
spear_thermal.c:(.text+0x230): undefined reference to 
`thermal_zone_device_register'

This changes the symbol to a tristate, so Kconfig can track the
dependency correctly.

Signed-off-by: Arnd Bergmann <[email protected]>
---
 drivers/thermal/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 8cc4ac64a91c..0852fd028dc9 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -195,7 +195,7 @@ config IMX_THERMAL
          passive trip is crossed.
 
 config SPEAR_THERMAL
-       bool "SPEAr thermal sensor driver"
+       tristate "SPEAr thermal sensor driver"
        depends on PLAT_SPEAR || COMPILE_TEST
        depends on OF
        help
-- 
2.7.0

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