ARM: davinci: remove unused davinci_cfg_reg_list() declaration

The davinci_cfg_reg_list() has been removed since
commit dec85a95 ("ARM: davinci: clean up platform support"),
so remove it.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20240813071640.1047137-2-cuigaosheng1@huawei.comSigned-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

arch/arm/mach-davinci/mux.h

@@ -654,14 +654,9 @@ enum davinci_da850_index {
 #ifdef CONFIG_DAVINCI_MUX
 /* setup pin muxing */
 extern int davinci_cfg_reg(unsigned long reg_cfg);
-extern int davinci_cfg_reg_list(const short pins[]);
 #else
 /* boot loader does it all (no warnings from CONFIG_DAVINCI_MUX_WARNINGS) */
 static inline int davinci_cfg_reg(unsigned long reg_cfg) { return 0; }
-static inline int davinci_cfg_reg_list(const short pins[])
-{
-	return 0;
-}
 #endif