misc: ibmasm: command: Demote function headers from kerneldoc

The correct format is not used and no attempt has been made
to document the function arguments. Makes sense to just demote
the header back down to a simple comment.

Fixes the following W=1 warnings:

drivers/misc/ibmasm/command.c:106: warning: Function parameter or member 'sp' not described in 'ibmasm_exec_command'
drivers/misc/ibmasm/command.c:106: warning: Function parameter or member 'cmd' not described in 'ibmasm_exec_command'
drivers/misc/ibmasm/command.c:149: warning: Function parameter or member 'cmd' not described in 'ibmasm_wait_for_response'
drivers/misc/ibmasm/command.c:149: warning: Function parameter or member 'timeout' not described in 'ibmasm_wait_for_response'
drivers/misc/ibmasm/command.c:162: warning: Function parameter or member 'sp' not described in 'ibmasm_receive_command_response'
drivers/misc/ibmasm/command.c:162: warning: Function parameter or member 'response' not described in 'ibmasm_receive_command_response'
drivers/misc/ibmasm/command.c:162: warning: Function parameter or member 'size' not described in 'ibmasm_receive_command_response'

Cc: "Max Asböck" <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/ibmasm/command.c

···
 	}
 }
 
-/**
+/*
  * exec_command
  * send a command to a service processor
  * Commands are executed sequentially. One command (sp->current_command)
···
 	}
 }
 
-/**
+/*
  * Sleep until a command has failed or a response has been received
  * and the command status been updated by the interrupt handler.
  * (see receive_response).
···
 				timeout * HZ);
 }
 
-/**
+/*
  * receive_command_response
  * called by the interrupt handler when a dot command of type command_response
  * was received.