bpf: One more maintainer for libbpf and BPF selftests

I've been working on BPF verifier, BPF selftests and, to some extent,
libbpf, for some time. As suggested by Andrii and Alexei,
I humbly ask to add me to maintainers list:
- As reviewer   for BPF [GENERAL]
- As maintainer for BPF [LIBRARY]
- As maintainer for BPF [SELFTESTS]

This patch adds dedicated entries to MAINTAINERS.

Signed-off-by: Eduard Zingerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

Author: eddyz87

MAINTAINERS

@@ -3792,6 +3792,7 @@ M:	Alexei Starovoitov <[email protected]>
 M:	Daniel Borkmann <[email protected]>
 M:	Andrii Nakryiko <[email protected]>
 R:	Martin KaFai Lau <[email protected]>
+R:	Eduard Zingerman <[email protected]>
 R:	Song Liu <[email protected]>
 R:	Yonghong Song <[email protected]>
 R:	John Fastabend <[email protected]>
@@ -3852,6 +3853,7 @@ F:	net/unix/unix_bpf.c
 
 BPF [LIBRARY] (libbpf)
 M:	Andrii Nakryiko <[email protected]>
+M:	Eduard Zingerman <[email protected]>
 L:	[email protected]
 S:	Maintained
 F:	tools/lib/bpf/
@@ -3909,6 +3911,7 @@ F:	security/bpf/
 
 BPF [SELFTESTS] (Test Runners & Infrastructure)
 M:	Andrii Nakryiko <[email protected]>
+M:	Eduard Zingerman <[email protected]>
 R:	Mykola Lysenko <[email protected]>
 L:	[email protected]
 S:	Maintained