Both packages `ombnia-mcu-firmware` and `omnia-mcutool` would depend on
a specific device. The buildbots however build all devices and therefore
the package isn't build at all, due to unmet dependencies.

While this didn't cause issues with OPKG, APK fails actively due to the
missing packages. Drop the specific dependency, however wants to install
unrelated firmware on any device can do that anyway.

Signed-off-by: Paul Spooren <mail@aparcar.org>