openrisc: remove unused current_regs

Signed-off-by: Jonas Bonn <jonas@southpole.se>

arch/openrisc/include/asm/processor.h

@@ -70,7 +70,6 @@ struct thread_struct {
  */
 
 #define task_pt_regs(task) user_regs(task_thread_info(task))
-#define current_regs() user_regs(current_thread_info())
 
 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)