m68k: apollo: Make local reset, serial, and irq functions static

When building with W=1:

    arch/m68k/apollo/config.c:132:6: warning: no previous prototype for ‘dn_serial_print’ [-Wmissing-prototypes]
      110 | void dn_serial_print (const char *str)
	  |      ^~~~~~~~~~~~~~~
    arch/m68k/apollo/dn_ints.c:8:14: warning: no previous prototype for ‘apollo_irq_startup’ [-Wmissing-prototypes]
	8 | unsigned int apollo_irq_startup(struct irq_data *data)
	  |              ^~~~~~~~~~~~~~~~~~
    arch/m68k/apollo/dn_ints.c:19:6: warning: no previous prototype for ‘apollo_irq_shutdown’ [-Wmissing-prototypes]
       19 | void apollo_irq_shutdown(struct irq_data *data)
	  |      ^~~~~~~~~~~~~~~~~~~
    arch/m68k/apollo/dn_ints.c:29:6: warning: no previous prototype for ‘apollo_irq_eoi’ [-Wmissing-prototypes]
       29 | void apollo_irq_eoi(struct irq_data *data)
	  |      ^~~~~~~~~~~~~~

Fix this by making all local functions static.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/d2b3a6785d3e80069fea85921c72cf0b7afb8493.1694613528.git.geert@linux-m68k.org

arch/m68k/apollo/config.c

@@ -29,7 +29,7 @@ u_long apollo_model;
 extern void dn_sched_init(void);
 extern void dn_init_IRQ(void);
 extern int dn_dummy_hwclk(int, struct rtc_time *);
-extern void dn_dummy_reset(void);
+static void dn_dummy_reset(void);
 #ifdef CONFIG_HEARTBEAT
 static void dn_heartbeat(int on);
 #endif
@@ -107,7 +107,7 @@ static void __init dn_setup_model(void)
 
 }
 
-void dn_serial_print (const char *str)
+static void dn_serial_print(const char *str)
 {
     while (*str) {
         if (*str == '\n') {
@@ -207,8 +207,8 @@ int dn_dummy_hwclk(int op, struct rtc_time *t) {
 
 }
 
-void dn_dummy_reset(void) {
-
+static void dn_dummy_reset(void)
+{
   dn_serial_print("The end !\n");
 
   for(;;);

arch/m68k/apollo/dn_ints.c

@@ -5,7 +5,7 @@
 #include <asm/traps.h>
 #include <asm/apollohw.h>
 
-unsigned int apollo_irq_startup(struct irq_data *data)
+static unsigned int apollo_irq_startup(struct irq_data *data)
 {
 	unsigned int irq = data->irq;
 
@@ -16,7 +16,7 @@ unsigned int apollo_irq_startup(struct irq_data *data)
 	return 0;
 }
 
-void apollo_irq_shutdown(struct irq_data *data)
+static void apollo_irq_shutdown(struct irq_data *data)
 {
 	unsigned int irq = data->irq;
 
@@ -26,7 +26,7 @@ void apollo_irq_shutdown(struct irq_data *data)
 		*(volatile unsigned char *)(picb+1) |= (1 << (irq - 8));
 }
 
-void apollo_irq_eoi(struct irq_data *data)
+static void apollo_irq_eoi(struct irq_data *data)
 {
 	*(volatile unsigned char *)(pica) = 0x20;
 	*(volatile unsigned char *)(picb) = 0x20;