[sonic-sairedis] Update Submodule

[gechiang]

Advance submodule head for sonic-sairedis on Master branch

- Why I did it
The following are the commits in the submodule:

Workaround getSwitchType failure due to NPU SAI not yet supporting it (#647)
commit 4a3a568ad12d8f953c4b4a33ae39744a5bd57025

Adding support for new SAI API sai_query_attribute_capability() (#645)
commit 8d3ae8c6546dcfdc06cf84e1a59bc2a615651a72

[syncd] ARM32 bit fixes, for 64bit printf format specifier. (#643)  
Signed-off-by: Rajkumar Pennadam Ramamoorthy <rpennadamram@marvell.com>
commit 8809d53871169775e8869328679987ba56e4c426

[syncd] Add support for synchronous bulk api (#640)
commit d54bfb45435685059578ea53453e797b87241617

- How I did it
Update sairedis submodule commit pointer

- Description for the changelog

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

[lguohan]

retest vsimage please

[gechiang]

Retested the BRCM image.
Summary:
DUT boot up fine. All services are up. No core/crash observed with the associated changes. Syslog shows the get switch type failed but default to NPU type and moved on. performed "show interface status" and observed all ports/LAGs were up.
I have copied those output in a file and attached
updateSairedisSubmoduleValidationResult.txt

[lguohan]

retest vsimage please