bpf: Include linux/types.h for u32

Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
the header linux/types.h. Including it directly on the top level helps
to avoid potential problems if linux/types.h hasn't been included
before.

The main motivation to introduce this it is to avoid similar problems that
have shown up in the bpftool where GNU libc indirectly pulls
linux/types.h causing compile error of the form:

   error: unknown type name 'u32'
                             u32 cnt;
                             ^~~

The bpftool compile error was fixed in
62248b22d01e ("tools/resolve_btfids: fix build with musl libc").

Signed-off-by: Dmitrii Bundin <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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