CONFIG_THERMAL option was changed to boolean in upstream linux commit
554b3529fe01 ("thermal/drivers/core: Remove the module Kconfig's option").
Switch it to 'y' and remove FILES and AUTOLOAD for non-existant module file.
And update the descripton text for the package as in upstream linux commit
eb8504620381 ("thermal: Rephrase the Kconfig text for thermal").
Signed-off-by: Sungbo Eo <mans0n@gorani.run>