msm: camera: sensor: flash: Fix flash driver

Fix flash issues after adding "unified flash driver".
Unified flash driver commit Id: c1592988
These are the changes made:
Max current and max duration are properly propogated to userspace
Flash current (main and torch) are properly sent to kernel

Change-Id: Ic9d715d41a842b258d1c88a5379bc2a5b0e38092
Signed-off-by: Ivan Tiyanov <ivant@codeaurora.org>
Signed-off-by: Rajesh Bondugula <rajeshb@codeaurora.org>