Merge remote-tracking branch 'origin/rf_emulator_and_timers_fix' into integration_2025_w34 (!3589)

RF emulator and improvements of the timers

RF emulator:
Add an RF library emulating a real device without the need of a real
device.  This is thought to enable using phy-test without requiring a
radio device or channel simulation.  The library synchronizes on the
real time clock, drops TX and generate noise on RX.  Noise generation
can be disabled and the noise level configured.

Timers improvements:
- Fix standard deviation for merged timers
- Add display of ULSCH decoding timers
- Add decoding timer in AAL

common/config/DOC/config/rtusage.md

@@ -55,7 +55,6 @@ To get help on supported parameters you can use specific options:
     --ulsch-max-errors: set the eNodeB max ULSCH erros
     --phy-test: test UE phy layer, mac disabled
     --usim-test: use XOR autentication algo in case of test usim mode
-    --emulate-rf: Emulated RF enabled(disable by defult)
     --clock: tells hardware to use a clock reference (0:internal, 1:external, 2:gpsdo)
     --wait-for-sync: Help string not specified
     -C: Set the downlink frequency for all component carriers

common/utils/time_meas.h

@@ -193,6 +193,7 @@ static inline void merge_meas(time_stats_t *dst_ts, const time_stats_t *src_ts)
     return;
   dst_ts->trials += src_ts->trials;
   dst_ts->diff += src_ts->diff;
+  dst_ts->diff_square += src_ts->diff_square;
   if (src_ts->max > dst_ts->max)
     dst_ts->max = src_ts->max;
 }