e1000e: cleanup SPACING checkpatch errors and warnings

ERROR:SPACING: spaces prohibited around that ':' (ctx:WxV)
ERROR:SPACING: need consistent spacing around '-' (ctx:WxV)
ERROR:SPACING: space required after that ',' (ctx:VxV)
ERROR:SPACING: spaces required around that '=' (ctx:VxV)
WARNING:SPACING: missing space after enum definition

and some similar spacing issues not reported by checkpatch.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>