i9300: remove DeviceSettings

Change-Id: I7373199b7f776f733c6e107a34df941011e8cb2c
(cherry picked from commit 371d1e8dbb2fe0425d4c26633caf393ece74d748)
i9300: rename sysfs node for pwm level

Change-Id: I0683c56cfa4f019a4997bd256267c3cd9860ef7b
(cherry picked from commit 2bc3f26d3c39cd5012e6cf2f9059c33c1789a539)