Update mbedtls to version 3.6.2

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.

Signed-off-by: Ryan Everett <ryan.everett@arm.com>
Change-Id: I3496fbe54c3d85f7a5330b49cd77ccd16f7cb7fa
diff --git a/tf_config/fvp-tbb-mbedtls b/tf_config/fvp-tbb-mbedtls
index 129bc9a..82098c3 100644
--- a/tf_config/fvp-tbb-mbedtls
+++ b/tf_config/fvp-tbb-mbedtls
@@ -1,7 +1,7 @@
 ARM_ROTPK_LOCATION=devel_rsa
 CROSS_COMPILE=aarch64-none-elf-
 GENERATE_COT=1
-MBEDTLS_CONFIG_FILE=\"${tf_root}/include/drivers/auth/mbedtls/mbedtls_config-3.h\"
+MBEDTLS_CONFIG_FILE=\"${tf_root}/include/drivers/auth/mbedtls/default_mbedtls_config.h\"
 PLAT=fvp
 ROT_KEY=plat/arm/board/common/rotpk/arm_rotprivk_rsa.pem
 TRUSTED_BOARD_BOOT=1