Previously when we initialized the TLB we would allocate a number of
TLB entries which would be marked as valid. As a result the TLB
contained an entry which would be considered a valid entry for the 0
page.
Change-Id: I23ace86426a171a4f6200ebeb29ad57c21647036 Reviewed-by: Curtis Dunham <curtis.dunham@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>