ixgbevf: Commonize mailbox write/read

ixgbevf: Commonize mailbox write/read

Orabug: 24568240

With changes to ixgbevf_write_msg_read_ack(), other functions are
performing the same operations done here; change those functions to
utilize ixgbevf_write_msg_read_ack().

Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 221c556acbd76154c34015b7cbbb3621ae7dbc7c)
Signed-off-by: Brian Maly <brian.maly@oracle.com>