[PATCH] bonding: make functions not static

The sysfs code needs access these functions, so make them
not static, and move the protos to the header file.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>