By default, the full configuration enables all options. But we
specifically don't want to enable MBEDTLS_ECP_WITH_MPI_UINT except where
it's done explicitly, because it disables the old ecp. So it needs to be
added to the exceptions in config.py (EXCLUDE_FROM_FULL).
Signed-off-by: Janos Follath <janos.follath@arm.com>