staging: mt7621-pci: white-space cleanups.

- remove white space at end of line.
- no more than 2 blank line at a time
- remove spaces before tabs
- use tabs to line things up
- re-indent some #define do{}while(0)

Signed-off-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>