MSIM: be more inteligent in giving the SIM a name

* Only try to get the name if we have conditions to do so;
* If we want to fallback to a default name, call it "SIM x" instead of "SUB 0x"
* If we have a defined name, use that, even if it isn't user-defined

Change-Id: Ic134dde032857f35040ed3bab8774c06f6ed71ce