doc: removed mention of l2cache perf service

Removed mention of l2cache perf service
from 54H documentation.

Signed-off-by: Francesco Domenico Servidio <francesco.servidio@nordicsemi.no>

Author: FrancescoSer

doc/nrf/app_dev/device_guides/nrf54h/ug_nrf54h20_architecture_ipc.rst

@@ -208,7 +208,6 @@ The System Controller exposes the following services to local cores (Application
    * MRAM latency management (related to power management)
    * CPU frequency management (using Dynamic Voltage and Frequency Scaling)
    * Die temperature service
-   * L2CACHE performance
    * Power output service
 
 Fast Lightweight Processor (FLPR)