ASoC: samsung: Remove obsoleted declaration for s3c64xx_ac97_setup_gpio

The s3c64xx_ac97_setup_gpio() have been removed since
commit 0d297df ("ARM: s3c: simplify platform code"), and now
it is useless, so remove it.

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20240826033118.4021727-1-cuigaosheng1@huawei.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: gscui

include/linux/platform_data/asoc-s3c.h

@@ -13,8 +13,6 @@
 
 #include <linux/dmaengine.h>
 
-extern void s3c64xx_ac97_setup_gpio(int);
-
 struct samsung_i2s_type {
 /* If the Primary DAI has 5.1 Channels */
 #define QUIRK_PRI_6CHAN		(1 << 0)