ASoC: codec: Remove pxa2xx-ac97.c

ASoC: codec: Remove pxa2xx-ac97.c

With commit ce79f3a1ad5f ("ARM: pxa: prune unused device support") and
commit 2548e6c76ebf ("ARM: pxa: pxa2xx-ac97-lib: use IRQ resource"), there
is no 'pxa2xx-ac97' platform device created by machine level code, so this
driver could be removed.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Link: https://patch.msgid.link/20260122-sound-cleanup-v1-2-0a91901609b8@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>