[dsme] Allow custom modules to be loaded. Contributes to JB#49564.
[dsme] Allow custom modules to be loaded. Contributes to JB#49564.

This dsme.service file modification allows to load custom modules by
enlisting them in the systemd environment file.
Custom modules could be loaded both before default sequence (hardcoded
in startup.so or defined in its config file) and after.

Signed-off-by: Bogdan Migunov <226260a9b1d602c9855df06a16e3ef0f6c26e89e@yandex.ru>

spiiroin/dsme,spiiroin/dsme