nrf_security: remove CONFIG_MBEDTLS_ENABLE_HEAP

It now makes sense to have it enabled only when CONFIG_MBEDTLS because
it doesn't exist in TF-PSA-Crypto.
Remove the redefinition of this Kconfig option so we just use the one
from Zephyr which is already guarded properly.

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

Author: tomi-font

subsys/nrf_security/Kconfig

@@ -84,15 +84,6 @@ config TF_PSA_CRYPTO_USER_CONFIG_FILE
 	  Used for PSA_NEED_* configurations.
 	  This file is auto-generated with the values of the relevant Kconfig options.
 
-config MBEDTLS_ENABLE_HEAP
-	bool "Global heap for mbed TLS"
-	help
-	  This option enables the mbedtls to use the heap. This setting must
-	  be global so that various applications and libraries in Zephyr do not
-	  try to do this themselves as there can be only one heap defined
-	  in mbedtls. If this is enabled, then the Zephyr will, during the device
-	  startup, initialize the heap automatically.
-
 if MBEDTLS_ENABLE_HEAP
 
 config MBEDTLS_HEAP_SIZE