MIPS: sgi-ip22: Add prototypes for several functions to header

This fixes the following build warning:

arch/mips/sgi-ip22/ip22-time.c:119:18: error: no previous prototype for ‘indy_8254timer_irq’ [-Werror=missing-prototypes]
arch/mips/sgi-ip22/ip22-berr.c:89:6: error: no previous prototype for ‘ip22_be_interrupt’ [-Werror=missing-prototypes]
arch/mips/sgi-ip22/ip22-berr.c:113:13: error: no previous prototype for ‘ip22_be_init’ [-Werror=missing-prototypes]

Reported-by: k2ci <[e-mail]>
Signed-off-by: Genjian Zhang <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/include/asm/sgi/ip22.h

···
 
 extern unsigned short ip22_eeprom_read(unsigned int *ctrl, int reg);
 extern unsigned short ip22_nvram_read(int reg);
+extern void ip22_be_interrupt(int irq);
+extern void ip22_be_init(void) __init;
+extern void indy_8254timer_irq(void);
 
 #endif

arch/mips/sgi-ip22/ip22-int.c

···
 #define SGI_INTERRUPTS	SGINT_LOCAL3
 #endif
 
-extern void indy_8254timer_irq(void);
-
 /*
  * IRQs on the INDY look basically (barring software IRQs which we don't use
  * at all) like:

arch/mips/sgi-ip22/ip22-setup.c

···
 #include <asm/sgi/hpc3.h>
 #include <asm/sgi/ip22.h>
 
-extern void ip22_be_init(void) __init;
-
 void __init plat_mem_setup(void)
 {
 	char *ctype;