backlight: set minimum brightness to 1

minimum brightness is 10 by default, which can be pretty bright at night. allow it to be set below 10, with 1 being the default.

Change-Id: Ia8d90b257be95bae01c5f4b38c545f74b519f0ef
defconfigs: enable dynamic page writeback

Change-Id: Ie5a6a0c8ef5131975613d805bf216313354da530
Merge pull request #5 from TeamCanjica/3.0.31

defconfigs: enable dynamic page writeback