staging: mt7621-pci: remove some dead code.

Some code is dead because it is commented out.
Some is dead because it is uninteresting printks.
Some is dead because it declares unused functions.

Remove it all.

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