ARM: pxa: ssp: use devm_ functions

Use devm_ functions to allocate memory, ioremap, clk_get etc to clean up
the error unwind path.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>