[riot-notifications] [RIOT-OS/RIOT] cpu/fe310: Mark registers as clobbered and allow using immediates for values (#15837)

Koen Zandberg notifications at github.com
Fri Jan 22 11:42:29 CET 2021


And some assembly from tests/bench_thread_yield_pingpoing:

#### Before:

```
   0:   4781                    li      a5,0
   2:   853e                    mv      a0,a5
   4:   85be                    mv      a1,a5
   6:   00000073                ecall
```

#### after

```
   0:   00000513                li      a0,0
   4:   00000593                li      a1,0
   8:   00000073                ecall
```

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