[DPB] [Mellanox] added capability files for SN2700-D40C8S8 SKU#4

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dprital wants to merge 3 commits intomasterfrom

dror_new_master2_sku

Commits on Feb 23, 2021

Support hwsku.json file for new sku Mellanox-SN2700-D40C8S8
dprital
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Commits on Feb 24, 2021

Fixhwsku.json file. by mistake ports 1 and 2 were split. now it is 1 and 3
dprital
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Added the blocked ports to the hwsku.json file, otherwise we get an error when generating the config
dprital
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