firmware: cs_dsp: fix kernel-doc warnings in a header file

firmware: cs_dsp: fix kernel-doc warnings in a header file

Use correct kernel-doc format to avoid kernel-doc warnings in
nclude/linux/firmware/cirrus/cs_dsp_test_utils.h:

- mark one struct member as private: since the comment says that it is
private
- add ending ':' to struct members where needed

Warning: include/linux/firmware/cirrus/cs_dsp_test_utils.h:30 struct
 member 'saw_bus_write' not described in 'cs_dsp_test'
Warning: include/linux/firmware/cirrus/cs_dsp_test_utils.h:53 struct
 member 'id' not described in 'cs_dsp_mock_alg_def'
Warning: ../include/linux/firmware/cirrus/cs_dsp_test_utils.h:53 struct
 member 'ver' not described in 'cs_dsp_mock_alg_def'
Warning: ../include/linux/firmware/cirrus/cs_dsp_test_utils.h:53 struct
 member 'xm_base_words' not described in 'cs_dsp_mock_alg_def'
Warning: ../include/linux/firmware/cirrus/cs_dsp_test_utils.h:53 struct
 member 'xm_size_words' not described in 'cs_dsp_mock_alg_def'
Warning: ../include/linux/firmware/cirrus/cs_dsp_test_utils.h:53 struct
 member 'ym_base_words' not described in 'cs_dsp_mock_alg_def'
Warning: ../include/linux/firmware/cirrus/cs_dsp_test_utils.h:53 struct
 member 'ym_size_words' not described in 'cs_dsp_mock_alg_def'
Warning: ../include/linux/firmware/cirrus/cs_dsp_test_utils.h:53 struct
 member 'zm_base_words' not described in 'cs_dsp_mock_alg_def'
Warning: ../include/linux/firmware/cirrus/cs_dsp_test_utils.h:53 struct
 member 'zm_size_words' not described in 'cs_dsp_mock_alg_def'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://patch.msgid.link/20251104192653.929157-1-rdunlap@infradead.org
Signed-off-by: Mark Brown <broonie@kernel.org>