[PATCH] random: fix a compilation error on arm64

[kernel test robot]

Hi Qian,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on linux/master v5.8 next-20200806]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Qian-Cai/random-fix-a-compilation-error-on-arm64/20200807-013039
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 47ec5303d73ea344e84f46660fff693c57641386
config: mips-randconfig-r015-20200805 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 076b120bebfd727b502208601012a44ab2e1028e)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

   In file included from kernel/fork.c:77:
>> include/linux/random.h:15:10: fatal error: 'asm/archrandom.h' file not found
   #include <asm/archrandom.h>
            ^~~~~~~~~~~~~~~~~~
   1 error generated.

vim +15 include/linux/random.h

    14	
  > 15	#include <asm/archrandom.h>
    16	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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