ARM: pxa168/gplugd: add the correct SSP device

There is no SSP0, but SSP1 is used on gplugd as an I2S port.

Acked-by: Tanmay Upadhyay <tanmay.upadhyay@einfochips.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>