Following is a rework of the i2s code for the pxa. I tested it with the ac97 clock as the master clock.

Feedbacks are welcome.

Diff with initial version:

- hw init from 1/4 is moved from pxa2xx_i2s_init to pxa2xx_i2s_probe - moved 'removal of hw reset from pxa2xx_i2s_startup' from 3/4 to 1/4v2 - moved 'clk_put(clk_i2s) removal' from 2/4 to 3/4v2 - 3/4 was also removing FIFOs flushes, 3/4v2 consists of 'clk_put(clk_i2s) removal' only,