staging: most: dim2: hal: Demote non-conformant kernel-doc headers

staging: most: dim2: hal: Demote non-conformant kernel-doc headers

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

 drivers/staging/most/dim2/hal.c:99: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 drivers/staging/most/dim2/hal.c:788: warning: Function parameter or member 'buf_size' not described in 'dim_norm_isoc_buffer_size'
 drivers/staging/most/dim2/hal.c:788: warning: Function parameter or member 'packet_length' not described in 'dim_norm_isoc_buffer_size'
 drivers/staging/most/dim2/hal.c:788: warning: expecting prototype for Retrieves maximal possible correct buffer size for isochronous data type(). Prototype was for dim_norm_isoc_buffer_size() instead
 drivers/staging/most/dim2/hal.c:802: warning: Function parameter or member 'buf_size' not described in 'dim_norm_sync_buffer_size'
 drivers/staging/most/dim2/hal.c:802: warning: Function parameter or member 'bytes_per_frame' not described in 'dim_norm_sync_buffer_size'
 drivers/staging/most/dim2/hal.c:802: warning: expecting prototype for Retrieves maximal possible correct buffer size for synchronous data type(). Prototype was for dim_norm_sync_buffer_size() instead

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210414181129.1628598-36-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>