Revert "Bug 985888 - [DSDS] Display currently in-use SIM cards on call buttons. r=rik"

This reverts commit 6ac53288eeaeb34013f39a98762948a481481cf1.
Revert "Bug 980982 - [DSDS] Cache ril.xxx.defaultServiceId in MSAB to avoid IO thrashing. r=rik"

This reverts commit 2709783b5a4d2f338c583ee66081d00033e4fd50.