misc: mei: hw.h: fix kernel-doc warnings

Fix kernel-doc warnings in hw.h:

hw.h:809: warning: missing initial short description on line:
 * struct hbm_client_dma_unmap_request
hw.h:812: warning: contents before sections
hw.h:825: warning: missing initial short description on line:
 * struct hbm_client_dma_response
hw.h:828: warning: contents before sections

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20231012024845.29169-2-rdunlap@infradead.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>