boards nrf54l15bsim: Remove out of date notes in doc

Remove two out of date/incorrect notes in the documentation for this
board:
For quite a while now, we have models of some parts of the CRACEN HW.
Since f4cdb0f we are using the CRACEN
RNG driver.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

boards/native/nrf_bsim/doc/nrf54l15bsim.rst

@@ -90,6 +90,4 @@ ARM's TrustZone is not modeled in this board. This means that:
   can be labeled as restricted for secure or non secure access.
 * TF-M cannot be used.
 
-Note that the CRACEN peripheral is not modeled.
 As crypto library, Mbed TLS can be used with its SW crypto backend.
-As entropy driver, the :dtcompatible:`zephyr,native-posix-rng` is enabled by default.