AHCI: Increase link timeout to 200ms

AHCI: Increase link timeout to 200ms

In 73545f75b66d "ahci: wait longer for link" I increased the
timeout to 40ms based on the observed behaviour of a WD disk on a
Cubietruck. Since then Karsten Merker and myself have both
observed timeouts with HGST disks (Karsten on Cubietruck, me on
Cubieboard2). Increasing the timeout to ~175ms fixes this, so go
to 200ms for a bit of headroom.

Signed-off-by: Ian Campbell <[email protected]>
Cc: Karsten Merker <[email protected]>
Acked-by: Hans de Goede <[email protected]>