Merge branch 'bpf-Add-syscall-lookup-support-for-fd-array-and-htab'

Martin KaFai Lau says:

====================
bpf: Add syscall lookup support for fd array and htab

This patchset adds BPF_MAP_LOOKUP_ELEM syscall support for
BPF_MAP_TYPE_PROG_ARRAY,
BPF_MAP_TYPE_ARRAY_OF_MAPS and
BPF_MAP_TYPE_HASH_OF_MAPS
====================

Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>