mei: me: use io register wrappers consistently

1. Use mei_device structure as the first argument to the io
register access wrappers so we'll have access to the device
structure needed for tracing.

2. Use wrapper consistently

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>