MAINTAINERS: Add myself for ARM32 BPF JIT maintainer.

As Shubham has been inactive since 2017, Add myself for ARM32 BPF JIT.

Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20230907230550.1417590-10-puranjay12@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>