Added RS544 extended fec variants

[pullaraogunda]

This PR introduces four new enums to sai_port_fec_mode_extended_t

[tjchadaga]

/azp run

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[mobinmohan]

Thanks for taking care of this change. This is required for 200G PAM4.

[pullaraogunda]

SAI_PORT_FEC_MODE_EXTENDED_RS544_INTERLEAVED_ETC :
This mode conforms to 800G ETC.
Link : https://ethernettechnologyconsortium.org/wp-content/uploads/2021/10/Ethernet-Technology-Consortium_800G-Specification_r1.1.pdf

SAI_PORT_FEC_MODE_EXTENDED_RS544_INTERLEAVED_IEEE :
This mode is conforms to CL172 of IEEE 802.3df (for 800Gx8-lane) and pre-draft 802.3dj (for 1.6Tx8, 800Gx4, 400Gx2, 200Gx1)
Link to 802.3df : https://ieeexplore.ieee.org/document/10472445
Link to 802.3dj : https://standards.ieee.org/ieee/802.3dj/11115/

ETC and IEEE vary only in bitmux. IEEE specifies that the 4:1 bitmux must contain 2 FEC lanes from flow-0 (lanes 0-15) and two FEC lanes from flow-1 (lanes 16-31). The ETC spec implies bitmuxing is restricted within the two sets of FEC lanes (lanes 0-15 and lanes 16-31). These two modes can interop with each other.

SAI_PORT_FEC_MODE_EXTENDED_RS544_LOW_LATENCY :
This mode is a low latency variant of SAI_PORT_FEC_MODE_EXTENDED_RS544 that has a 1:1 ratio of FEC lanes to physical lanes and does symbol distribution to FEC lanes with no bit multiplexing.

[mobinmohan]

Thanks for taking care of this.

[mikeberesford]

Please look for whether we can use a name that is less ambiguous than "IEEE" here since SAI_PORT_FEC_MODE_EXTENDED_RS544_INTERLEAVED is also an IEEE spec

[pullaraogunda]

Renamed SAI_PORT_FEC_MODE_EXTENDED_RS544_INTERLEAVED_IEEE to SAI_PORT_FEC_MODE_EXTENDED_RS544_INTERLEAVED_CL172.

SAI_PORT_FEC_MODE_EXTENDED_RS544_INTERLEAVED confirms to IEEE 802.3bs standard (Clause 119) used for 200G/400G.
This new fec mode SAI_PORT_FEC_MODE_EXTENDED_RS544_INTERLEAVED_IEEE confirms to IEEE 802.3df standard (Clause 172) used for 800G+ports.

[tjchadaga]

/azp run

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[tjchadaga]

@pullaraogunda - could you please squash your commits and force push to ensure meta check passes?

[pullaraogunda]

@tjchadaga squashed the commits. Please check and integrate it

[tjchadaga]

/azp run

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