[low-power] enhance mCslFrameRequestAheadUs calculation for RCP
#101
| Job | Run time |
|---|---|
| 3m 5s | |
| 3m 5s | |
| 2m 33s | |
| 2m 33s | |
| 22m 15s | |
| 22m 15s | |
| 15m 4s | |
| 15m 4s | |
| 16m 58s | |
| 17m 45s | |
| 3m 0s | |
| 3m 0s | |
| 2m 38s | |
| 2m 38s | |
| 2m 32s | |
| 2m 32s | |
| 0s | |
| 21s | |
| 2h 17m 18s |