ASoC: pxa: pxa-ssp: Demote seemingly unintentional kerneldoc header

ASoC: pxa: pxa-ssp: Demote seemingly unintentional kerneldoc header

This is the only use of kerneldoc in the sourcefile and full
descriptions are not provided.

Fixes the following W=1 kernel build warning(s):

sound/soc/pxa/pxa-ssp.c:186: warning: Function parameter or member
'ssp' not described in 'pxa_ssp_set_scr'

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Link: https://lore.kernel.org/r/20200709162328.259586-6-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>