NtMapViewOfSection should check the parameter BaseAddress to ensure that it is at 64-k boundary.

For the current implementation of NtMapViewOfSection in ARM3/section.c, it doesn't check the BaseAddress to make sure it is at 64-k boundary, and thus make the test in apitest/ntdll/NtMapViewOfSection.c:58 fails.

And I have run this test on Windows 2003 Server SP1, this failing test passes ! This means the implementation of ROS lack this check. So this patch adds this check !