Delete SElinux permissive from BoardConfigCommon.mk

Due to some error I will set up SElinux permissive on kernel defconfig.

SElinux set permissive with that commit on kernel.

For N7000: https://gerrit.omnirom.org/#/c/2865/

For I9100: https://gerrit.omnirom.org/#/c/2866/

Change-Id: I9b57c2e694e18da5124adf85eebab8cb7a284e85