MIPS: launch.h: add include guard to prevent build errors

MIPS: launch.h: add include guard to prevent build errors

arch/mips/include/asm/mips-boards/launch.h needs an include guard
to prevent it from being #included more than once.
Prevents these build errors:

In file included from ../arch/mips/mti-malta/malta-amon.c:16:
../arch/mips/include/asm/mips-boards/launch.h:8:8: error: redefinition of 'struct cpulaunch'
    8 | struct cpulaunch {
      |        ^~~~~~~~~
In file included from ../arch/mips/include/asm/mips-cps.h:13,
                 from ../arch/mips/include/asm/smp-ops.h:16,
                 from ../arch/mips/include/asm/smp.h:21,
                 from ../include/linux/smp.h:114,
                 from ../arch/mips/mti-malta/malta-amon.c:12:
../arch/mips/include/asm/mips-boards/launch.h:8:8: note: originally defined here
    8 | struct cpulaunch {
      |        ^~~~~~~~~
make[3]: [../scripts/Makefile.build:273: arch/mips/mti-malta/malta-amon.o] Error 1 (ignored)

Fixes: 6decd1aad15f ("MIPS: add support for buggy MT7621S core detection")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@vger.kernel.org
Cc: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Reviewed-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>