perf(linux): AM62AX: Update PREEMPT_RT perf numbers for 11.1

Update the real time Linux latency numbers for SDK 11.1

Signed-off-by: Bryan Brattlof <[email protected]>

Author: bryanbrattlof

source/devices/AM62AX/linux/RT_Linux_Performance_Guide.rst

@@ -1,5 +1,5 @@
 ======================================
- RT-linux 11.00 Performance Guide
+ RT-linux 11.01 Performance Guide
 ======================================
 
 .. rubric::  **Read This First**
@@ -57,14 +57,24 @@ Test commands used for running stress-ng and cyclictest together
    stress-ng --cpu-method=all -c 4 &
    cyclictest -m -Sp80 -D6h -h400 -i200 -M -q
 
-The latencies where observed with this SDK are summarized below:
+The following summarizes the latencies observed using the yocto based
+default SDK image:
+
+.. note::
+
+   A known issue in this SDK release is affecting this benchmark.
+   Using OP-TEEs PRNG drivers rather than the hardware accelerated
+   TRNG drivers restores the context switch latencies to the values you
+   see here.
+
+   More information on switching to the PRNG drivers can be found in the
+   Foundational Components section, here :ref:`building-optee-with-prng`
 
 .. csv-table::
    :header: "Latencies","CPU 0","CPU 1","CPU 2","CPU 3"
 
    "Minimum (us)","5","5","5","5"
-   "Average (us)","5","6","6","5"
-   "Maximum (us)","68","31","34","28"
+   "Average (us)","6","6","6","6"
+   "Maximum (us)","31","29","30","30"
 
 .. image:: img/rt-cpu-method-all-latency-histogram.png
-