[Mellanox] [201911]: Update SDK to 4.4.2208 and FW to *.2008.2208

[keboliu]

- Why I did it
To pick up new features and bug fix:

Features:

• Spectrum-3 | Systems | Added GA-level support for SN4700 A0 system
• All | Shared headroom | Added GA-level support for Shared headroom between PGs

Bugs fixes:

• All | Counters | Sent traffic in certain size is wrongly increase to a smaller size counter, because port extended counter has a counter for sent traffic per packet-size range
• All | Shared buffer | Configuring shared buffer on the fly may, on occasion, cause the chip to get stuck
• Spectrum-2 | Modules | On occasion, link down is experienced with INPHI COLORZ PAM4 100G optic cables on SN3700 systems

- How I did it

Update the version number in related make files and update the SDK repo pointer

- How to verify it

Run regression test on Mellanox platform

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

• 201811
• 201911
• 202006
• 202012

- Description for the changelog

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