nrf_security: Remove unused platform keys

The platform keys are not used anymore by nRF54H20 or
any other device so remove them.

Signed-off-by: Georgios Vasilakis <[email protected]>

Author: Vge0rge

subsys/nrf_security/include/psa/nrf_platform_key_ids.h

@@ -155,9 +155,3 @@ if(CONFIG_PSA_NEED_CRACEN_KEY_AGREEMENT_DRIVER OR CONFIG_PSA_NEED_CRACEN_KEY_DER
     ${CMAKE_CURRENT_LIST_DIR}/src/key_derivation.c
   )
 endif()
-
-if(CONFIG_PSA_NEED_CRACEN_PLATFORM_KEYS)
-  list(APPEND cracen_driver_sources
-    ${CMAKE_CURRENT_LIST_DIR}/src/platform_keys/platform_keys.c
-  )
-endif()