aports: extract aw88261_acf.bin on-device instead of shipping it

New package fp6-vendor-blobs: a manifest-driven systemd oneshot that
copies proprietary blobs out of the stock Android partitions on first
boot. pmOS installs flash only boot+userdata, so every installed unit
still carries the stock vendor/dsp partitions - the device duplicates a
file it already contains, for its own operation, and nothing proprietary
is distributed by us. Partitions are mounted read-only (ext4 additionally
with noload - not even a journal replay touches the stock data), every
copy is sha256-pinned and a miss fails loudly, and the consuming devices
are unbound and re-probed afterwards so the feature works the same boot.

The rebind is unconditional by design: aw88261 binds on a bare i2c
chip-id probe and requests the ACF only at ASoC card init (~21 s, after
SoundWire enumeration), so a bound device can still be one that lost the
firmware race - and that failed request is never retried.

soc-fairphone-fp6-audio (pkgver 4) stops shipping the blob, installs the
manifest fragment instead, and re-runs the extractor from
post-install/post-upgrade so upgrades restore the file immediately (the
old package version removed it on upgrade). License drops back to plain
BSD-3-Clause - nothing proprietary left in the package.

Verified on the dev phone (fp6 repo journal/blobs/captures/
2026-08-24-first-boot-extractor-verification.txt): first-boot extraction
+ same-boot audio, mid-session post-upgrade recovery, and the everyday
fast-path no-op; committed files byte-identical to the tested deployment.

Assisted-by: Claude:claude-fable-5

aports/device/soc-fairphone-fp6-audio/aw88261-acf.manifest

@@ -0,0 +1,10 @@
+# AW88261 smart-amp config blob (proprietary, Awinic) - extracted from the
+# stock vendor partition on-device instead of being shipped (fp6 repo
+# journal/blobs/, 2026-08-24). Slot A first, slot B as fallback; the copy
+# must hash-match the blob the audio stack was tested with.
+file vendor_a,vendor_b firmware/aw882xx_acf.bin /usr/lib/firmware/qcom/milos/fairphone/fp6/aw88261_acf.bin af723973655ba5901948d4a22212323e39ce53ff0156021185720af4af6ab0b3
+# the amps bind on i2c probe but request the ACF only at card init, which
+# races the extractor on first boot and is never retried on failure - a
+# forced fresh probe of both amps makes audio work that same boot either way
+rebind i2c 6-0034
+rebind i2c 6-0035