[nrf fromlist] secure_fw: partitions: Make ITS a weak dependency for crypto

Internal Trusted Storage is listed as a dependency for the crypto
partition. However if only the RNG or HASH modules are needed from
the crypto partition then ITS is not required.
Excluding ITS partition provides a smaller TF-M image.

Use-case for this is to fit TF-M within 32K on the nrf9160 DK in cases
where only RNG is needed from crypto.

Upstream PR:
https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/13772

Change-Id: Ibb471111f2fbdb3414cff2c7e05331cdcdbc07e1
Signed-off-by: Joakim Andersson <[email protected]>
(cherry picked from commit c64fb59)

Author: joerchan

secure_fw/partitions/crypto/tfm_crypto.yaml

@@ -481,7 +481,7 @@
       "version_policy": "STRICT"
     },
   ],
-  "dependencies": [
+  "weak_dependencies": [
     "TFM_INTERNAL_TRUSTED_STORAGE_SERVICE"
   ]
 }