v2 e1000: Neaten e1000_dump function

Use pr_<level> for printk
Use temporary instead of multiple pr_conts
Coalesce formats.

Save a few bytes of object code too:

$ size drivers/net/ethernet/intel/e1000/e1000_main.o*
   text	   data	    bss	    dec	    hex	filename
  60507	    369	  14120	  74996	  124f4
drivers/net/ethernet/intel/e1000/e1000_main.o.new
  60717	    369	  14176	  75262	  125fe
drivers/net/ethernet/intel/e1000/e1000_main.o.old

Removed printing of pktdata.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Tushar Dave <tushar.n.dave@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>