sparc: remove two unused headers

Nothing includes these two headers. None of the macros they define are
used anywhere in the tree. This was also the case in v2.6.12-rc2 and,
presumably, every release in between. These two headers can safely be
removed.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>