[nrf toup][nrfconnect] remove CONFIG_NRF_SECURITY_ADVANCED

It has been unused for some time and is about to be removed in NCS.

Signed-off-by: Tomi Fontanilles <tomi.fontanilles@nordicsemi.no>

Author: tomi-font

config/nrfconnect/chip-module/Kconfig.defaults

@@ -427,9 +427,6 @@ if !CHIP_CRYPTO_PSA
 config OBERON_BACKEND
     default y
 
-config NRF_SECURITY_ADVANCED
-    default y
-
 config MBEDTLS_AES_C
     default y