b43: support radio 2057 rev 8

b43: support radio 2057 rev 8

Add support for radio 2057 revision 8, paired with N-PHY rev 8 on
the Broadcom BCM6362 single-die integrated 2.4 GHz wireless block.

Three correlated changes are needed for the same chip:

  - main.c: the radio_rev allow-list under B43_PHYTYPE_N currently
    accepts radio 2057 revisions 9 and 14 only; extend to include
    rev 8.

  - radio_2057.c: the existing r2057_rev8_init[] is a 54-entry stub
    declared inside a TODO comment block and never referenced
    from r2057_upload_inittabs().
    Replace it with the full 412-entry register set actually
    programmed by the proprietary Broadcom wl driver on this radio.
    I couldn't find the origin of the original 54-entry stub - 8
    of its entries do not appear at all in the rev 8 register set
    and 7 more carry different values.
    Loading it instead of using the real table leaves the radio
    hanging producing a "Microcode not responding" timeout.

  - radio_2057.c: r2057_upload_inittabs() case 8 handles radio_rev
    5 and 7 only; add the radio_rev == 8 branch pointing at the
    new table.

The init table is extracted from an MMIO dump of the radio
register set programmed during proprietary driver initialisation
on BCM6362 silicon (Broadcom wl driver 6.30.102.7).

Assisted-by: Claude:claude-4.7-opus
Signed-off-by: Alessio Ferri <alessio.ferri@mythread.it>
Acked-by: Michael Büsch <m@bues.ch>
Reviewed-by: Joshua Peisach <jpeisach@ubuntu.com>
Link: https://patch.msgid.link/20260528-b43_complete_n_phy_rev_8_radio_2057_rev_8_support-v4-4-464566194d47@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>