[CFS] add demo program #261
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stnolting
added
DOC
reworked CFS user logic; added CFS demo program
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This PR reworks the "user" logic of the default Custom Functions Subsystem (CFS) hardware module and also adds a simple example program to illustrate how to use/access the CFS from software (->
sw/example/demo_cfs).The default CFS now implements four exemplary memory-mapped registers that perform simple, combinatorial data transformations: