[sival/entropy_src] Add entropy_src_fips_mode_health_test #25719
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This test implements the entropy source test,
"chip_sw_entropy_src_fips_mode_health_tests" scenario as described in the OpenTitan testplan.
ENTROPY_SRC in FIPS realistic mode provides sufficient seed to required modues to process the data.
ENTROPY_SRC in FIPS stringent mode signals a recoverable alert if the total failure counter hits the threshold.
See: /hw/top_earlgrey/data/ip/chip_entropy_src_testplan.hjson