package/gdb: enable gdbserver support for riscv

package/gdb: enable gdbserver support for riscv

It turn out that gdbserver support for riscv is available since 10.1 release, since commit [1].

Restrict the gdb version choice for riscv to 10.1 for simplicity [2].

[1] https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=bf84f7066626c78884436e1c39fb60f04c665f21
[2] http://lists.busybox.net/pipermail/buildroot/2021-June/312681.html

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>