Remove most MccTable hidden APIs after Q

Remove most MccTable hidden APIs after Q, except for countryCodeForMcc()
which appears to have one usage. All others are false positives brought
about by apps including com.android.internal.telephony implementation
code in their APK, that is not supported.

Test: none
Bug: 142853043
Change-Id: I126904f1302fcf81c6ac7ec69addac0ce396eefb