Add Michael Clark, Palmer Dabbelt, Sagar Karandikar and Bastian
Koppelmann as RISC-V Maintainers.
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: NAlistair Francis <alistair.francis@xilinx.com>
Signed-off-by: NBastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: NSagar Karandikar <sagark@eecs.berkeley.edu>
Signed-off-by: NPalmer Dabbelt <palmer@sifive.com>
Signed-off-by: NMichael Clark <mjc@sifive.com>