ixgbe: update X550 SFP identification

Use ixgbe_identify_sfp_module_X550em to update SFP identification
flow. ixgbe_identify_sfp_module_X550em includes specific checks for
X550 about supported SFP modules.

Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

Approved by: imp
Obtained from: DPDK (175bedb0cc8f801be3050fa35b8d8d0971cea7cc)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31621

(cherry picked from commit 0a4f0befab9d3a048232b00bea77bf3da20cfdd0)