libata: Implement ATA_FLAG_NO_DIPM and apply it to mcp65

libata: Implement ATA_FLAG_NO_DIPM and apply it to mcp65

BugLink: http://bugs.launchpad.net/bugs/775809

commit ae01b2493c3bf03c504c32ac4ebb01d528508db3 upstream.

NVIDIA mcp65 familiy of controllers cause command timeouts when DIPM
is used.  Implement ATA_FLAG_NO_DIPM and apply it.

This problem was reported by Stefan Bader in the following thread.

 http://thread.gmane.org/gmane.linux.ide/48841

stable: applicable to 2.6.37 and 38.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>