[MIPS] Alchemy: Fix modpost warnings.

  MODPOST vmlinux
WARNING: arch/mips/au1000/common/built-in.o(.text+0x1750): Section mismatch: reference to .init.data: (between 'au1xxx_platform_init' and '__fixup_bigphys_addr')
WARNING: arch/mips/au1000/common/built-in.o(.text+0x1754): Section mismatch: reference to .init.data: (between 'au1xxx_platform_init' and '__fixup_bigphys_addr')
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/au1000/common/platform.c

@@ -289,7 +289,7 @@ static struct platform_device *au1xxx_platform_devices[] __initdata = {
 #endif
 };
 
-int au1xxx_platform_init(void)
+int __init au1xxx_platform_init(void)
 {
 	return platform_add_devices(au1xxx_platform_devices, ARRAY_SIZE(au1xxx_platform_devices));
 }