[thermalmanager] Added support for low temperature warning

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>
[bootlogger] Added more info to bootlogger JB#14632

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>
Fix comment
Merge branch 'low_temp_warning'
Merge branch 'master' of github.com:nemomobile/dsme
Merge pull request #50 from plundstr/master

[thermalmanager] Added support for low temperature warning