Revert "Revert "ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS""

This reverts commit a30a16cf877e4882e6fa00004fdcb63664addd1d

Change-Id: I6a13cede987785870b458f222aaf084490091c92
Merge "Revert "Revert "ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS""" into cm-10.1-staging