Add more Cequint provider and signature check.

This change expands Cequint Caller ID to more provider name and adds signature
check to avoid fake provider fraud.

Bug: 69061848,69310040
Test: CequintPackageUtilsTest
PiperOrigin-RevId: 176386836
Change-Id: I02bb3f67d74f7cccbf99b0967e517595c6c2033b
3 files changed