[201911] Adding SKU Mellanox-SN3800-D100C12S2#7972

Merged

prsunny merged 10 commits intosonic-net:201911from

madhanmellanox:201911MellanoxSN3800D100C12S2SKU

Jun 30, 2021

Commits on Jun 24, 2021

Commits on Jun 25, 2021

reverted back buffer values to previous values accounting all the ports
Madhan Babu
committed
fixed the SAI XML file for 50G with split 2 tag
Madhan Babu
committed

Commits on Jun 29, 2021

modified 10G ports according to HW restrictions
Madhan Babu
committed