samples/settings: Specify TFM maximum asset size

When using the TFM version of trusted storage, we need
to specify the maximum asset size.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

samples/subsys/settings/prj.conf

@@ -7,3 +7,5 @@ CONFIG_NVS=y
 CONFIG_SETTINGS_NVS=y
 CONFIG_HEAP_MEM_POOL_SIZE=256
 CONFIG_MPU_ALLOW_FLASH_WRITE=y
+CONFIG_TFM_ITS_MAX_ASSET_SIZE_OVERRIDE=y
+CONFIG_TFM_ITS_MAX_ASSET_SIZE=256