BC47xx build errors

[Ralf Baechle <ralf@linux-mips.org>]

A less than smart build test system has flagged the following build error:

  CC      arch/mips/bcm47xx/irq.o
In file included from arch/mips/bcm47xx/irq.c:32:0:
./arch/mips/include/asm/mach-bcm47xx/bcm47xx.h:34:1: error: expected identifier
+before
+‘}’ token
 };

I don't have any .config or anything for this error.  While trying to
reproduce this error I tried to build bcm47xx_defconfig but with
CONFIG_BCM47XX_SSB and CONFIG_BCM47XX_BCMA disabled.  That resulted in
the following build error:

  CC	  arch/mips/bcm47xx/irq.o
In file included from arch/mips/bcm47xx/irq.c:32:0:
./arch/mips/include/asm/mach-bcm47xx/bcm47xx.h:34:1: error: empty enum is
+invalid
 };
 ^
scripts/Makefile.build:302: recipe for target 'arch/mips/bcm47xx/irq.o' failed
make[1]: *** [arch/mips/bcm47xx/irq.o] Error 1
Makefile:1663: recipe for target 'arch/mips/bcm47xx/irq.o' failed

  Ralf