CHROMIUMOS: wpa_supplicant: Accept raw PMK in new DBus API

CHROMIUMOS: wpa_supplicant: Accept raw PMK in new DBus API

"psk" field, in set_network_properties(), was always getting quoted even when
containing a raw key (64 characters length representing the hexadecimal value
of the raw key).

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@nokia.com>;

(pulled from upstream patch)

BUG=chromium-os:13727
TEST=WiFiManager/022CheckWPA_RawPMK

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=f2e1f1f

[Sam Leffler, 2011-03-31 21:15:38]

Missed this local change in the switch over.  We need to cherry-pick until
upstream discussion completes.

[Paul Stewart, 2011-03-31 23:37:03]

LGTM