[nrf noup] samples/tests: Add TF-M sysbuild config files

Fixes some issues with samples/tests by adding configuration
files to satisfy TF-M requirements

Signed-off-by: Jamie McCrae <[email protected]>
(cherry picked from commit 0064688)

Author: nordicjm

samples/subsys/usb/dfu/sysbuild.conf

@@ -0,0 +1 @@
+SB_CONFIG_BOOTLOADER_MCUBOOT=y