pxa/h5000: Setup I2S pins for pxa2xx-i2s

The iPAQ h5000 has an AK4535 codec connected as I2S slave,
PXA I2S providing SYSCLK.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>