ACPICA: Fix for Load operator, load table at the namespace root

This reverts a change introduced in version 20071019. The table
is now loaded at the namespace root even though this goes against
the ACPI specification.  This provides compatibility with other
ACPI implementations.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>