Make sonic-vpp use vs/vpp combined libsai

[yue-fred-gao]

Why I did it

sonic-vpp sai layer has been merged with vs libsai by PR sonic-net/sonic-sairedis#1473. This reduces a lot of duplication. Now we need to modify sonic-vpp image build to utilize the combined libsai

Work item tracking

• Microsoft ADO (number only):

How I did it

• Add rules/vpp.mk to build vpp debian packages from platform/vpp. The Makefile in platform/vpp will download debian packages if they are available in online storage. Otherwise, it will build it from source. See With combined libsai sonic-platform-vpp#174
• Modify sairedis.mk with dependency on vpp debian packages, which are needed to build the combined libsaivs.
• Introduced new sai.profile for vpp, which sets SAI_VS_SWITCH_TYPE to SAI_VS_SWITCH_TYPE_VPP. See Use sai_vpp.profile when starting vpp syncd sonic-sairedis#1591 for choosing the profile when starting vpp syncd.

How to verify it

Build sonic-vpp image and run sonic-mgmt tests

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[mssonicbld]

/azp run Azure.sonic-buildimage

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Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[liushilongbuaa]

/azpw ms_conflict