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19712: cpu/riscv: Add PMP driver r=MrKevinWeiss a=Teufelchen1
### Contribution description
Hi! 🐘
this adds a basic RISC-V physical memory protection (PMP) driver to RIOT. Well, 'driver' might be a stretched, feels more like a little utility :)
EDIT: Also added a no-execute RAM option for the hifive & a corresponding test
Since I only have an Hifive rev b, it's only enabled on this board / cpu. I also tested the code on an ESP32-C but the feature can't be enabled there, as `cpu/riscv_common/` is not used by the ESP32...
### Testing procedure
* Grab a hifive rev b
* go to `examples/hello-world`
* Add `USEMODULES += periph_pmp` to the `Makefile`
* Include `pmp.h` in `main.c`
* Add code e.g. `print_pmpcfg(0);`
* compile & flash & term
You should see something like this:
```
# Hello World!
# You are running RIOT on a(n) hifive1b board.
# This board features a(n) fe310 MCU.
# pmp00cfg: - R-X OFF 0x00000000 - 0x00000000
```
Co-authored-by: Teufelchen1 <bennet.blischke@outlook.com>
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| .. | ||
| macros | ||
| assert.h | ||
| bitarithm.h | ||
| cib.h | ||
| clist.h | ||
| compiler_hints.h | ||
| container.h | ||
| debug.h | ||
| irq.h | ||
| kernel_defines.h | ||
| kernel_init.h | ||
| list.h | ||
| log.h | ||
| modules.h | ||
| panic.h | ||
| priority_queue.h | ||
| ringbuffer.h | ||
| riot_version.h | ||
| rmutex.h | ||
| thread_config.h | ||
| xfa.h | ||