nissa: use the dedicated USB mux task
nissa: use the dedicated USB mux task

The integrated muxes on ADL can take a long time to respond, so we want
to unblock PD while that runs.

BUG=b:223749568
TEST=task is now listed in `kernel threads`
BRANCH=none

Signed-off-by: Peter Marheine <ef0b2c492edde94778d7465bfbaeed52c5be6858@chromium.org>
Change-Id: Ibde2ffd00eba8c72784f8d54551712210a113dcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3518706
Reviewed-by: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec