RISC-V: run savedefconfig for defconfig

RISC-V: run savedefconfig for defconfig

It's been a while since this was run, and there's a few things that have
changed. Firstly, almost all of the Renesas stuff vanishes because the
config for the RZ/Five is gated behind NONPORTABLE. Several options
(like CONFIG_PM) are removed as they are the default values.

To retain DEFVFREQ_THERMAL and BLK_DEV_THROTTLING, add PM_DEVFREQ and
BLK_CGROUP respectively.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240717-shrubs-concise-51600886babf@spud
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>