fs: remove generic_acl

And instead convert tmpfs to use the new generic ACL code, with two stub
methods provided for in-memory filesystems.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/Kconfig
Simple merge

diff --cc fs/Makefile
Simple merge

diff --cc fs/generic_acl.c
Simple merge

diff --cc fs/posix_acl.c
Simple merge

diff --cc include/linux/generic_acl.h
Simple merge

diff --cc include/linux/posix_acl.h
Simple merge

diff --cc mm/shmem.c
Simple merge