ixgbe: Fix register defines to correctly handle complex expressions

ixgbe: Fix register defines to correctly handle complex expressions

This patch is meant to address possible issues with the IXGBE register
defines generating incorrect values when given a complex expression for the
register offset.

(cherry picked from commit 795be954dcc4a72329c8591aafe5eadb03b264af)
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Joe Jin <joe.jin@oracle.com>