firmware: arm_scmi: Provide a missing function param description

gcc as well as clang now produce warnings for missing kerneldoc function
parameter.

Fix the following W=1 kernel build warning:

drivers/firmware/arm_scmi/smc.c:32:
 warning: Function parameter or member 'shmem_lock' not described in 'scmi_smc'

Link: https://lore.kernel.org/r/[email protected]
Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>

Author: sudeep-holla

drivers/firmware/arm_scmi/smc.c

@@ -21,6 +21,7 @@
  *
  * @cinfo: SCMI channel info
  * @shmem: Transmit/Receive shared memory area
+ * @shmem_lock: Lock to protect access to Tx/Rx shared memory area
  * @func_id: smc/hvc call function id
  */