Staging: ccree: Remove unused variable monitor_lock

Remove the variable monitor_lock as it is not used anywhere.

Signed-off-by: Srishti Sharma <[e-mail]>
Reviewed-by: Sean Paul <[e-mail]>
Acked-by: Gilad Ben-Yossef <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/ccree/ssi_request_mgr.c

···
 	dma_addr_t dummy_comp_buff_dma;
 	struct cc_hw_desc monitor_desc;
 
-	volatile unsigned long monitor_lock;
 #ifdef COMP_IN_WQ
 	struct workqueue_struct *workq;
 	struct delayed_work compwork;