Merge branch 'enforce W^X for trampoline and dispatcher'

Song Liu says:

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Changes v1 => v2:
1. Update arch_prepare_bpf_dispatcher to use a RO image and a RW buffer.
   (Alexei) Note: I haven't found an existing test to cover this part, so
   this part was tested manually (comparing the generated dispatcher is
   the same).

Jeff Layton reported CPA W^X warning linux-next [1]. It turns out to be
W^X issue with bpf trampoline and bpf dispatcher. Fix these by:

1. Use bpf_prog_pack for bpf_dispatcher;
2. Set memory permission properly with bpf trampoline.

[1] https://lore.kernel.org/lkml/c84cc27c1a5031a003039748c3c099732a718aec.camel@kernel.org/
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Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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