find7: Fix lcd_density for Find7S

Change-Id: Ia3ead447711a91a81a792ea4da76d20d85271c5a
find7: Use camera interface for torch

* Sysfs node is on/off only anyway.

Change-Id: I8f1fc10460efb8cae543799e31f689a8919922cc
Merge branch 'cm-11.0' into kk_mkt