[nrf noup] modules: hostap: Fix Enterpise mode with nRF security

The PEM Kconfig symbols is non-standard and isn't available for nRF
security, for now add a check to enable that only for MbedTLS builtin
which is not applicable for nRF security.

Fixes NCSDK-30762.

Signed-off-by: Chaitanya Tata <[email protected]>
(cherry picked from commit c21cc96)

Author: krish2718

modules/hostap/Kconfig

@@ -183,7 +183,7 @@ config WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA
 
 config WIFI_NM_WPA_SUPPLICANT_CRYPTO_ENTERPRISE
 	bool "Enterprise Crypto support for WiFi"
-	select MBEDTLS_PEM_CERTIFICATE_FORMAT
+	select MBEDTLS_PEM_CERTIFICATE_FORMAT if MBEDTLS_BUILTIN
 	depends on !WIFI_NM_WPA_SUPPLICANT_CRYPTO_NONE
 
 config EAP_TLS