[PATCH] apparmor: Change to use DEFINE_SHOW_ATTRIBUTE macro

[kbuild test robot]

Hi Yangtao,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on security/next-testing]
[also build test ERROR on v4.20-rc1 next-20181106]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Yangtao-Li/apparmor-Change-to-use-DEFINE_SHOW_ATTRIBUTE-macro/20181107-004056
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git next-testing
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

>> security/apparmor/apparmorfs.o:(.data.rel+0x110): undefined reference to `aa_sfs_seq_file_ops'
   security/apparmor/apparmorfs.o:(.data.rel+0x228): undefined reference to `aa_sfs_seq_file_ops'
   security/apparmor/apparmorfs.o:(.data.rel+0x250): undefined reference to `aa_sfs_seq_file_ops'
   security/apparmor/apparmorfs.o:(.data.rel+0x278): undefined reference to `aa_sfs_seq_file_ops'
   security/apparmor/apparmorfs.o:(.data.rel+0x2c8): undefined reference to `aa_sfs_seq_file_ops'
   security/apparmor/apparmorfs.o:(.data.rel+0x2f0): more undefined references to `aa_sfs_seq_file_ops' follow

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