Allow config of wfcSpnFormats to use root locale

Adds carrier config KEY_WFC_SPN_USE_ROOT_LOCALE. If true, the root
locale will be used when reading wfcSpnFormats. This means a
non-translated version of wfcSpnFormats will be used.

strings.xml in values-mcc262-mnc02 was deleted. The same requirement can
now be achieved by setting KEY_WFC_SPN_USE_ROOT_LOCALE to true.

Bug: 114292743
Test: Manual
Change-Id: Ia62976282c5526190d5d04361b1d4fbfc3333068