Add fustini riscv-config to linux-next

[Drew Fustini]

Hi Mark,

I have a new tree where I will apply patches for riscv defconfigs. I
have trees for dt and clk for two riscv soc vendors in next but
defconfig patches don't belong in such branches. Conor has in the past
taken defconfig patches but he is happy for me to send pull requests
as needed based on my new defconfig branches.

Please add these to linux-next:

riscv-config https://git.kernel.org/pub/scm/linux/kernel/git/fustini/linux.git#riscv-config-for-next
riscv-config-fixes https://git.kernel.org/pub/scm/linux/kernel/git/fustini/linux.git#riscv-config-fixes

Thanks,
Drew