Build: Change CONFIG_TFM_PARTITION_META to internal config

The CONFIG_TFM_PARTITION_META is currently a user configuration.
In the future, it will be force enabled in IPC backend.

This patch changes it from use config to internal config.

Note: It is disabled in all configurations currently but will
be enabled in the future.

Change-Id: Ifea4da898ce86504ee8da0849cf2bd1e09423fd9
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
5 files changed