Explicitly set module name in `zephyr/module.yml`

Follow Zephyr v3.2.0 new recommendation to explicitly set module
names to enable usage of ZEPHYR_<module-name-upper>_MODULE_DIR by
other modules.

Verification:

1. (Pass) west build -p always -b nrf52840dk_nrf52840 bootloader/mcuboot/boot/zephyr/
2. (Pass) ./zephyr/scripts/twister --testsuite-root zephyr/tests/subsys/dfu/
3. (Pass) ./zephyr/scripts/twister --testsuite-root zephyr/samples/subsys/mgmt/mcumgr/smp_svr/
4. (Pass) ./zephyr/scripts/twister --testsuite-root bootloader/mcuboot/boot/zephyr/

Fixes #1491

Signed-off-by: Gregory Shue <gregory.shue@legrand.com>