ALSA: hda - Enable sync_write workaround for AMD generically

ALSA: hda - Enable sync_write workaround for AMD generically

BugLink: http://bugs.launchpad.net/bugs/741825

Backport from d507cd668a3f6d07b31e914722b453c454b03204.

The workaround for AMD chipset via sync_write flag seems needed for
machines with Realtek codecs.  So, it's better to activate it
generically in hda_intel.c from the beginning.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>