intel_th: msu: Fix kernel-doc warnings

intel_th: msu: Fix kernel-doc warnings

Correct function comments to prevent kernel-doc warnings
found when using "W=1".

msu.c:162: warning: Function parameter or struct member 'mbuf_priv' not described in 'msc'
msu.c:164: warning: Function parameter or struct member 'orig_addr' not described in 'msc'
msu.c:164: warning: Function parameter or struct member 'orig_sz' not described in 'msc'

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Link: https://lore.kernel.org/r/20250211185017.1759193-2-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>