pass: thermal: Fix to handle priority of initial state properly

pass: thermal: Fix to handle priority of initial state properly

At first, priority is intended to treat lower value as higher
priority, but it is not handled intentionally when monitoring devices.
So this fixes to handle it properly and to this end it is required to
retrieve highest priority from the corresponding thermal device.
Finally, instead of plain scenario string the notifer_data structure
is passed as THERMAL_GET_SCENARIO parameter to get both scenario and
priority.

Change-Id: I330729be2890cdcb89ee7a677af2c0b8d4905fb0
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>