This patch adds a separate function for enabling Flow Control (FC)
auto-negotiation on X550em_a:
- rename ixgbe_fc_autoneg_x550a() to ixgbe_fc_autoneg_backplane_x550em_a().
- create ixgbe_fc_autoneg_fiber_x550em_a() specifically for fiber.
- add definitions for KRM_PCS_KX_AN_LP register and related bits.
Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
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