MAINTAINERS: add RISC-V BPF JIT maintainer

Add Björn Töpel as RISC-V BPF JIT maintainer.
Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

MAINTAINERS

@@ -2907,6 +2907,12 @@ L:	netdev@vger.kernel.org
 S:	Maintained
 F:	arch/powerpc/net/
 
+BPF JIT for RISC-V (RV64G)
+M:	Björn Töpel <bjorn.topel@gmail.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	arch/riscv/net/
+
 BPF JIT for S390
 M:	Martin Schwidefsky <schwidefsky@de.ibm.com>
 M:	Heiko Carstens <heiko.carstens@de.ibm.com>