platform: add CVA6 platform and support for PMU.

[LE RHUN Jimmy]

Classified as: {OPEN}


Add a new platform called CVA6 (https://github.com/openhwgroup/cva6).
Add support for Performance Monitoring Unit for this platform.
This development starts from tag v1.5.

Signed-off-by: Jimmy Le Rhun <jimmy.lerhun at thalesgroup.com> 

{OPEN}
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