video: lm3530_bl: Fix backlight issue when suspend

Revert the min brightness check that prevents the driver
to turn off backlight when suspend.

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Merge branch 'jb-4.3-dev' into jb-4.3j
1.7.1j

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>