COMP: Namespace change for SpacePrecisionType

The location for the primary SpacePrecisionType changed
to only be from the itk:: namespace rather than being
aliased from ImageBase.

Change-Id: Ib96e578999a480260d42b8233540236ac341f224
Merge topic 'CompErrorSpacePrecisionChange'

895927a COMP: Namespace change for SpacePrecisionType