ASoC: pxa: remove duplicated CONFIG_SND_PXA2XX_AC97 entry

'config SND_PXA2XX_AC97' is already present in sound/arm/Kconfig with
a prompt.

Commit 734c2d4b ("[ALSA] ASoC pxa2xx build support") redundantly
added the second one to sound/soc/pxa/Kconfig.

Remove it.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20240204091424.38306-1-masahiroy@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/pxa/Kconfig

@@ -8,9 +8,6 @@ config SND_PXA2XX_SOC
 	  the PXA2xx AC97, I2S or SSP interface. You will also need
 	  to select the audio interfaces to support below.
 
-config SND_PXA2XX_AC97
-	tristate
-
 config SND_PXA2XX_SOC_AC97
 	tristate "SoC AC97 support for PXA2xx"
 	depends on SND_PXA2XX_SOC