Update the NEORV32 SoC, peripheral drivers, and board to support NEORV32
v1.11.1. Notable changes include:
- Optional RISC-V ISA Kconfigs are now selected on the board level.
- Peripheral registers are now automatically reset in hardware, no need for
software initialization code.
- The NEORV32 GPIO controller now supports 32 pins, not 64. Interrupt
support will be submitted in a separate PR.
- Default board configuration has 64k RAM and is clocked at 18 MHz.
Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>
