telephony: MccTable: Updates for worldwide needs

* Spare 2 bits from country code to language code
  7 bits for each character of country code would be enough.
  LANG_STRINGS[]'s max index is now increased to 63 (from 15).
  FYI, there are at least 3 dozens of languages in frameworks.

* Lookup country's primary time zone from xml
  There are hundreds of time zones. Import all of them into
  MccTable wouldn't be a good idea. Now it gets the time zone
  ID from com.android.internal.R.xml.time_zones_by_country for
  MCCs without time zone assigned. As I see, the first entry
  matched in the xml would be the primary time zone for the
  specified country. We only need to assign time zones for
  countries that have more than one MCC and its time zone.

* Add a script to update MccTable.java automatically
  By executing tools/genmcctable, any changes to mcc_table in
  Python code will be updated to the auto generated section of
  Java code.

* Minor Changes
 - Fix indent of Java comment generated by Python
 - Set Chinese as the default language of Taiwan

Change-Id: I8724d9e8d5b733a91d5ec9f42ff33b17c9d23eb0