ANDROID: GKI: power: power_supply: Add property to display skin thermal status

Add power supply property POWER_SUPPLY_PROP_SKIN_HEALTH to indicate
skin thermal status.

Signed-off-by: Sahil Chandna <chandna@codeaurora.org>
(cherry picked from commit 4c6c4e79ded2fde0e11eb9c66da737de8018d575)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 150789066
Change-Id: Ib04d93cd0a74f39b23591c29c696c5a35c70291a