MIPS: OCTEON: read the L2 crippled fuses from MIO_FUS_DAT3 on OCTEON II

prom_init() decides whether to lock lines into the L2 by reading
L2D_FUS3, a CN3XXX/CN5XXX register. On OCTEON II the fuses that cripple
the L2 are MIO_FUS_DAT3[l2c_crip] - which is what cvmx_l2c_get_num_assoc()
already reads for those parts - so the test looks at an address that is
not a register on the chip and gets a meaningless answer: it can skip
L2 locking on a healthy cache, or lock into a reduced one.

Pick the register by family in a small helper.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Orgad Shaneh <orgads@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

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