ASoC: codec: rt286: Use devm_request_threaded_irq to manage IRQ lifetime and fix...

ASoC: codec: rt286: Use devm_request_threaded_irq to manage IRQ lifetime and fix smatch warning

Replace manual "request_threaded_irq()" with the device managed
"devm_request_threaded_irq" to manage the IRQ lifetime and also
it removes the smatch reported warning.
Remove the manual "free_irq()" in the "remove" function as free_irq
is tied to device teardown.

Signed-off-by: HariKrishna Sagala <hariconscious@gmail.com>
Link: https://patch.msgid.link/20251217054458.38257-2-hariconscious@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>