riscv: enable Docker requirements in defconfig

The defconfig kernel should be able to run Docker.

Enable the missing settings according to [1].
make savedefconfig eliminates CONFIG_STACKTRACE
which is enabled by default.

Many of the settings are also needed to run a defconfig kernel
on default distro installations or to run snaps.

[1] https://github.com/moby/moby/blob/master/contrib/check-config.sh

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Acked-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20220608000251.55271-1-heinrich.schuchardt@canonical.com
[Palmer: Drop BLK_CGROUP, as it's causing panics with KASAN]
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>