sh: hd64461: Make setup_hd64461() static

Enforce internal linkage for setup_hd64461().

This fixes the following error:
arch/sh/cchips/hd6446x/hd64461.c:75:12: error: no previous prototype for 'setup_hd64461' [-Werror=missing-prototypes]
Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: https://lore.kernel.org/r/20240211193451.106795-1-contact@artur-rojek.euSigned-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>

arch/sh/cchips/hd6446x/hd64461.c

@@ -72,7 +72,7 @@ static void hd64461_irq_demux(struct irq_desc *desc)
 	}
 }
 
-int __init setup_hd64461(void)
+static int __init setup_hd64461(void)
 {
 	int irq_base, i;