[MIPS] SEAD: Delete seadint_init() prototype.

    
There is no definition for seadint_init() and the unprotected prototype
breaks compilation of assembler files.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

include/asm-mips/mips-boards/seadint.h

@@ -23,6 +23,4 @@
 #define SEADINT_UART0     2
 #define SEADINT_UART1     3
 
-extern void seadint_init(void);
-
 #endif /* !(_MIPS_SEADINT_H) */