ril: service: Fix breakage introduced by f7c75aa4

Before:
    if (response == NULL || numStrings != 3) {
After:
    if (response == NULL || numStrings != mqanelements - 2) {

This patch fixes the logic so we don't change the value check.

"mqanelements" is not related to getOperatorResponse, so get get rid of
the affected code.

Change-Id: I86c6ae7b7492a5d04fbc8dc415c4f615e7d05bab