PKSM: Squashed revert of PKSM commits

Implementation seems to cause problems with SELinux.

Revert "d2: defconfig: Enable PKSM"

This reverts commit e3d25b60f11a7782382dfd4137153454d599ee26.

Revert "mm: pksm: Clean up unused KSM leftovers"

This reverts commit 3350b8b08ff642b7418c7fe8b0c543a77e255890.

Revert "mm: PKSMv0.2: Apply pksm-v0.2-for-linux3.6.0 patch"

This reverts commit ab8276fdfa166dcee9fb687936c762f79343649b.