perf(linux): AM64X: Update PREEMPT_RT perf numbers for 11.1

Update the real-time Linux latency numbers for SDK 11.1

Signed-off-by: Bryan Brattlof <bb@ti.com>

Author: bryanbrattlof

source/devices/AM64X/linux/RT_Linux_Performance_Guide.rst

@@ -64,8 +64,8 @@ The latencies observed with this DK are summarized below:
    :header: "Latencies","CPU 0","CPU 1"
 
    "Minimum (usec)","6","6"
-   "Average (usec)","8","8"
-   "Maximum (usec)","77","105"
+   "Average (usec)","10","8"
+   "Maximum (usec)","85","64"
 
 .. image:: img/rt-cpu-method-all-latency-histogram.png