USB: Call USB_DC_INTERFACE callback when endpoints are found

[finikorg]

Provide also alt_set to callback to make right choice

Fixes #13560

[codecov-io]

Codecov Report

Merging #14829 into master will decrease coverage by 0.36%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master   #14829      +/-   ##
==========================================
- Coverage   52.87%    52.5%   -0.37%     
==========================================
  Files         310      309       -1     
  Lines       45319    45053     -266     
  Branches    10475    10420      -55     
==========================================
- Hits        23963    23656     -307     
- Misses      16575    16589      +14     
- Partials     4781     4808      +27

Impacted Files	Coverage Δ
subsys/usb/usb_device.c	11.26% <0%> (+0.13%)	⬆️
subsys/testsuite/ztest/include/ztest_assert.h	38.88% <0%> (-38.89%)	⬇️
include/spinlock.h	57.14% <0%> (-17.86%)	⬇️
kernel/mutex.c	83.82% <0%> (-13.28%)	⬇️
kernel/timeout.c	75.92% <0%> (-9.26%)	⬇️
kernel/include/kernel_structs.h	90.9% <0%> (-9.1%)	⬇️
kernel/sched.c	84.01% <0%> (-8.74%)	⬇️
include/misc/sflist.h	72.97% <0%> (-8.11%)	⬇️
include/misc/dlist.h	88.67% <0%> (-7.55%)	⬇️
subsys/testsuite/ztest/src/ztest.c	65.28% <0%> (-7.44%)	⬇️
... and 64 more

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[finikorg]

Applied in another PR.