mlxsw: reg: Add SMPE related fields to SFMR register

SFMR register creates and configures FIDs. As preparation unified bridge
model, add some required fields for future use.

The device includes two main tables to support layer 2 multicast (i.e.,
MDB and flooding). These are the PGT (Port Group Table) and the
MPE (Multicast Port Egress) table.
- PGT is {MID -> (bitmap of local_port, SPME index)}
- MPE is {(Local port, SMPE index) -> eVID}

In Spectrum-2 and later ASICs, the SMPE index is an attribute of the FID
and programmed via new fields in SFMR register - 'smpe_valid' and 'smpe'.

Add the two mentioned fields for future use and increase the length of
the register accordingly.

Signed-off-by: Amit Cohen <[email protected]>
Reviewed-by: Danielle Ratson <[email protected]>
Reviewed-by: Petr Machata <[email protected]>
Signed-off-by: Ido Schimmel <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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