Correct a typo where safety time is used for trickle charge time
in the code.
Add the valid ranges and power on defaults for safety timer and
trickle charge timer.
CRs-Fixed: 313652
Change-Id: I49a04c6445d197555b2a434bf4577b6e38e3d3e3
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>