PROBLEM:  (QAR 66935, QAR 66124)    (Patch ID: OSF435-098)
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This patch fixes a panic while prestoserve is enabled. The following error
message is seen:

        pnvram_read: Timed out attempting to acquire DMA semaphore

The stack trace is listed below:

    2 simple_lock_fault   
    3 simple_lock_hierarchy_violation  
    4 mntflushbuf          
    5 boot                
    6 panic                
    7 pnvram_read          
    8 prprepareio          
    9 prwritedirty         
   10 PRstrategy           
   11 RZstrategy           
   12 spec_strategy        
   13 call_disk            
   14 bs_startio           
   15 bs_q_blocking        
   16 bs_q_list            
   17 logflush_cont        
   18 bs_logflush_start    
   19 log_flush            
   20 lgr_writev_ftx       
   21 log_donerec_nunpin   
   22 ftx_done_urdr       
   23 ftx_done_n          
   24 msfs_fsync          
   25 fsync               
   26 syscall            
   27 _Xsyscall