tile: remove unused ISA_DMA_THRESHOLD define

No need to define ISA_DMA_THRESHOLD

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
[cmetcalf@tilera.com: converted to a single-line #include file]
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
1 file changed