ARM: sa1100: address missing prototype warnings

There are three warnings for mach-sa1100 when building with W=1:

arch/arm/common/sa1111.c:699:1: error: no previous prototype for 'sa1111_configure_smc' [-Werror=missing-prototypes]
  699 | sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac,
      | ^~~~~~~~~~~~~~~~~~~~
arch/arm/mach-sa1100/assabet.c:718:13: error: no previous prototype for 'assabet_init_irq' [-Werror=missing-prototypes]
  718 | void __init assabet_init_irq(void)
      |             ^~~~~~~~~~~~~~~~
arch/arm/mach-sa1100/pm.c:126:12: error: no previous prototype for 'sa11x0_pm_init' [-Werror=missing-prototypes]
  126 | int __init sa11x0_pm_init(void)
      |            ^~~~~~~~~~~~~~

The first two are only used locally and can be 'static', while
the last one needs to include the right header.

Link: https://lore.kernel.org/r/20230516153109.514251-12-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/common/sa1111.c

@@ -695,7 +695,7 @@ static u32 sa1111_dma_mask[] = {
 /*
  * Configure the SA1111 shared memory controller.
  */
-void
+static void
 sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac,
 		     unsigned int cas_latency)
 {

arch/arm/mach-sa1100/assabet.c

@@ -710,7 +710,7 @@ static void __init assabet_map_io(void)
 	sa1100_register_uart(2, 3);
 }
 
-void __init assabet_init_irq(void)
+static void __init assabet_init_irq(void)
 {
 	u32 def_val;
 

arch/arm/mach-sa1100/pm.c

@@ -33,6 +33,8 @@
 #include <asm/suspend.h>
 #include <asm/mach/time.h>
 
+#include "generic.h"
+
 extern int sa1100_finish_suspend(unsigned long);
 
 #define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x