Revert "omap4-common: Update to ro.ksm.default"

This reverts commit 04299e3e9618beb9ad500b4f24d5f5f22c495b72.
Revert "omap4-common: Enable KSM by default"

This reverts commit 10b394cbadd76fce6e1aceb981279641da7e1fea.