feat(mbedtls): mbedtls config update for v3.6.2

This new update to the LTS branch of MbedTLS provides
the fix for a buffer underrun vulnerability. TF-A does
not use the previously vulnerable functions
`mbedtls_pk_write_key_der` or `mbedtls_pk_write_key_pem`.
Full patch notes to this MbedTLS update can be found at
https://github.com/Mbed-TLS/mbedtls/releases/tag/mbedtls-3.6.2.

We now enforce the mbedtls version to be greater than or equal
to 3.6.2 in our default configs.

Change-Id: I79027f6c741ab3f419f7b555321507e6a78b977b
Signed-off-by: Ryan Everett <ryan.everett@arm.com>
diff --git a/include/drivers/auth/mbedtls/default_mbedtls_config.h b/include/drivers/auth/mbedtls/default_mbedtls_config.h
index 6ed9397..12a5fe1 100644
--- a/include/drivers/auth/mbedtls/default_mbedtls_config.h
+++ b/include/drivers/auth/mbedtls/default_mbedtls_config.h
@@ -11,6 +11,11 @@
  */
 
 /*
+ * This file is compatible with versions >= 3.6.2
+ */
+#define MBEDTLS_CONFIG_VERSION         0x03060200
+
+/*
  * Key algorithms currently supported on mbed TLS libraries
  */
 #define TF_MBEDTLS_RSA			1