Originally, the idea was to call entropy_complex_init in the ROM_EXT to
instantiate the RNG in a final FIPS state. However, the ROM_EXT is in
its frozen final version and the entropy_complex_init still has dummy
threshold values. Hence, the entropy_complex_init should be called from
firmware instead. However, the entropy_complex_init is only a driver
function returning a regular status_t, it is not an impl function with
an otcrypto_status_t. Hence, it is not opened up to the user. Instead,
make a wrapper to the functions needed by the user and add them in the
include folder.
Switch all functests to use the wrapper instead (since ideally to ingest
impl functions).

Collateral: looks like the driver was some glue for missing Bazel
dependencies, add rv_core_ibex to the random_order function.

Signed-off-by: Siemen Dhooghe <sdhooghe@google.com>

Set the entropy source driver to align with certified
NIST SP 800-90B requirements.

Specific changes include:

- NIST 800-90B Health Test Thresholds: Increased the `fips_test_window_size` to 2048 bits to comply with
        FIPS standards for binary noise sources.
- Bypass Register Configuration: Updated the `SET_FIPS_THRESH` and `VERIFY_FIPS_THRESH` macros to
        write and verify both the `FIPS_THRESH` and `BYPASS_THRESH` fields
        simultaneously.

Note: CSRNG `FIPS_FORCE_ENABLE` and EDN continuous polling rates remain at
their defaults to ensure the FIFO does not run empty with, for exmaple, the OTBN during the initial TRNG FIPS warm-up phase.

Signed-off-by: Siemen Dhooghe <sdhooghe@google.com>