extend device properties

[BenjaminW3]

SharedMemorySizeBytes
MaxClockFrequencyHz

Maybe also CoresPerMultiProcessor. This should be the number of cores with fast shared memory. On a two Processor node using OpenMP this should be the number of cores on one of the processors ( x const).
Do we really need this? BlockKernelsCountMax delivers the maximum block size which is more relevant.

[ax3l]

CoresPerMultiProcessor could be for a numa/cpu system: cores per socket.

allows you to define "shared" memory as the memory that is close to the socket and does not add additional latency over qpi, etc.

[sbastrakov]

@krzikalla just mentioned the shared memory size property via email. I guess this should be rather straightforward to implement. If there are no objections to have it added, I could provide a PR in a couple of days.