rewrite of ambient light sensor

Change-Id: Ife2ab008ba6cc6e2bc19107bd42480276685b962
leds-otter-button: corrected module load / naming

Change-Id: I98951e43edddd7d4a3450e56602dd54d9bc401ce
bma250: moved sysfs entries to i2c device / cleanup

Change-Id: I7b0c60b0e9bc154fd5e239ce15d1d09b1dd9a412
stk_als22x7: attach sysfs to i2c device / minor cleanup

Change-Id: I15beda92c781be267b76794014b5ab157759e6af
stk_als22x7: add max report value of 8192

Change-Id: I1779b9fc682a1894cf8d0f8d5e916a796af447e4