kernel: robustify dependencies in kmod-sound-hda-core

kernel: robustify dependencies in kmod-sound-hda-core

Dependency tracking for kmod-sound-hda-core is fragile. Enabling some sound
codecs (Realtek, Conexant, Sigmatel) implicitly adds a kmod-ledtrig-audio
dependency, while an enabled kmod-ledtrig-audio can be picked up through
enabling others (e.g. kmod-sound-hda-intel), and the behaviour can change
across kernel versions.

As kmod-ledtrig-audio is under 2KB, make it an unconditional dependency.

Fixes: a374b8f19051 ("kernel: 5.10: update sound modules")
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>