selinux: avoid unnecessary avc cache stat hit count

There is no point in counting hits - we can calculate it from the number
of lookups and misses.

This makes the avc statistics a bit smaller, and makes the code
generation better too.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --cc security/selinux/avc.c
Simple merge

diff --cc security/selinux/include/avc.h
Simple merge

diff --cc security/selinux/selinuxfs.c
Simple merge